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Issue Description You have found the phrase 'lead unsubscribed from list unsubscribe.' as the listed reason for a person being marked as Unsubscribed, or you are seeing it in the details of a 'Unsubscribe Email' action.  Issue Resolution This message appears when someone has unsubscribed using a special 'list-unsubscribe' option automatically contained in Marketo emails, as well as most other reputable marketing emails. This 'list-unsubscribe' feature is an email address contained in the background header information of the email. Any time someone sends an email to this address, their email address is unsubscribed from your database. This is almost always done by that person's email client, using their inbuilt 'unsubscribe' features, such as the ones in Outlook, Gmail, or other common email clients.
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Issue Description You have sent an email and do not see the List-Unsubscribe headers. Issue Resolution Marketo automatically adds the appropriate List-Unsubscribe headers to emails, EXCEPT in three scenarios: 1) The email is marked as operational 2) You are sending a test email via the "Send Sample" action 3) The email is an alert email In these cases, the List-Unsubscribe header will not be added to the email.
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Issue Description There are two email bounce filters and they both appear to function the same. Issue Resolution There are two email bounce filters: Email Bounces and Email Bounces Soft The Email Bounces filter only references leads that have had hard bounces occur. The bounce codes associated with hard bounces are 1 and 2. The Email Bounces Soft filter only references leads that have had soft bounces occur. The bounce codes associated with hard bounces are 3, 4, and 9. More can be read on bounce codes here.
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Issue Description The exact distinction between the "Email Bounces" and "Email Bounces Soft" filter and trigger is unclear. Issue Resolution The “Email Bounces” trigger or filter will look only at hard bounces, where Marketo received a definitive "No" from the target server. The “Email Bounces Soft” trigger or filter only looks at soft bounces, which occur when we are unable to deliver the email, but did not receive a rejection from the target server. You can use both filters with "OR" logic in order to look at all bounces.
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Issue Description How to add a seed list in a batch Smart Campaign or Email Program Issue Resolution Import the seed list addresses into an appropriately-named static list Add a filter in the Program/Campaign Smart List to include the static list. The trick will be to make sure the filter logic is correct. Advanced Logic may need to be used in the Smart List of the Program/Campaign. For example, if there's a sending campaign with 5 filters to send to an audience 1 AND 2 AND 3 AND (4 OR 5) then you will want to use Advanced Logic and put parentheses around the original filter set (1 AND 2 AND 3 AND (4 OR 5)) and add the seed list outside the parentheses with OR logic (1 AND 2 AND 3 AND (4 OR 5)) OR 6 In that advanced logic, the original intended membership (1 through 5) exist within its own set of parentheses and the Seed List is included in addition (OR 6).
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Issue Description Does Marketo have the ability to edit the email header detail for particular email sends? Issue Resolution Marketo currently does not provide an option via the UI to customize the headers of emails. Custom headers can be built at a cost. For more information, reach out to your Customer Success Manager.
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Issue Description You receive a DMARC report from an ISP saying that your email failed to pass the SPF alignment check, but when you check your SPF listing in Admin > Email > SPF/DKIM, SPF is verified. Issue Resolution The SPF record in Admin > Email > SPF/DKIM  is tied to your FROM domain.  DMARC alignment (using SPF) aligns the domain in the FROM address with the domain in the “return-path” address.  This “return-path” address, usually using a '*.mktomail.com' domain, is generally unseen by recipients and directs email bounces and errors back to Marketo for processing.  Failed DMARC alignment, between these two domains, is what is triggering the failure your DMARC reporting. DMARC compliance requires EITHER DKIM or SPF compliance, not both in most cases.  This article reviews the two methods available for DMARC alignment - https://nation.marketo.com/docs/DOC-1202-technical-tip-set-up-dmarc-verified-domains-in-a-few-easy-steps Having DKIM DMARC alignment may be enough and you may not need to rely on full SPF DMARC alignment. In order to set up SPF DMARC alignment, Branded Return-Path will allow you to align the “return-path” domain with your sending FROM address domain.  If you have a dedicated IP on the current pricing plan or are on the Trusted IP range, Marketo can brand your return path at no additional charge.  If you have a legacy Silver Dedicated IP package, or are on the Shared IP range, you can purchase the Branded Return Path as an add-on. More technical info can be found here: What is DMARC? - https://nation.marketo.com/docs/DOC-1097 https://nation.marketo.com/docs/DOC-5910-branded-envelopefrom-on-shared-or-trusted-ips https://nation.marketo.com/docs/DOC-5951-branded-envelopefrom-on-dedicated-ips
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Issue Description Often times customers ask which messages they should send to the Email Deliverability Power Pack seedlist.  Consider these guidelines to prioritize. Issue Resolution Routinely seed from each IP/domain combination Prioritize seeding to any of the following: High priority segments (customers, employees, investors, etc. that have high strategic value) High risk segments (lapsed subscribers, new audiences, audiences that have not been mailed for more than 3 months) even if they are low volume Segments showing poor/declining performance (lower opens/clicks/conversions) Segments that reflect large audiences (weekly/monthly newsletters or operational notifications that go to the entire database) Setup a recurring campaign that sends to one (or more) of the templates on a periodic basis, especially if you see declining performance. Who This Solution Applies To Customers with the Email Deliverability Power Pack
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Issue Description You need to know the encryption used in Marketo DKIM to make sure they are compliant with your corporate security standards. Issue Resolution By default, all Marketo DKIM keys use 1024 bit encryption. DKIM keys using a higher level of encryption are available by request.
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Issue Description An email hard bounces with reason "551 5.7.0 [internal] recipient blackholed".  The person is automatically marked as Email Invalid as a result.   Issue Resolution Blackholed addresses are those that Marketo have identified as spam traps, or those that have requested the Marketo Privacy team to block all Marketo originating emails.     Is this article helpful ? YesNo
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Issue Description General recommendations for managing and improving deliverability to China Issue Resolution If you are looking for general recommendations around delivering to China, here are some resources both from our Community and external sources. Navigating email delivery into China Golden Shield Project overview Sampi China Email Marketing and Chinese Anti-Spam Laws Summary English language version of the Measures for Administration of Email Service on Internet​ Lehman, Lee & Xu English language version of the Measures for the Administration of Internet E-mail Services 2006​
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Issue Description You have sent a Marketo email to the 250ok Seed List in Marketo, but you are not seeing the test within 250ok. Issue Resolution There are required email addresses in order for a Maketo email sent to an imported 250ok Seedlist to show up in 250ok. If you sent an email to an imported 250ok seedlist and you are not seeing the test, that means the required email addresses were not included in the email send. To resolve this, try the following Delete this existing seedlist from the database Navigate to Deliverability Tools, and export a new fresh seedlist Deliverability Tools > Inbox > Get Seedlist > copying the list into Excel > saving as a CSV file Import this new .CSV seedlist into Marketo Try the email send again to see if it then shows in 250ok. Make sure it goes to all emails on the seedlist If this does not resolve the issue, please contact Support. Who This Applies To Customers with the Deliverability Tools subscription addon
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Issue Description You or your customer have a global block on emails sent from servers with the domain "mktomail.com." You would like to keep the global block but allow email from your own Marketo instance to pass through.   Issue Resolution The return-path (or envelope_from) in the header of most Marketo emails includes the domain "mktomail.com." Some email servers may have a global block on this domain which prevents delivery of your Marketo emails. There are two options for bypassing this global block.   Contact your account manager to see about added the Branded Envelope_From feature to your instance. This will replace the "mktomail.com" domain with a domain of your choice. Have the email admin whitelist a Regex version of your return-path/envelope_from.  Which Regex you use will depend on which datacenter houses your instance. To determine the datacenter, look at the URL for your Marketo instance and see which letters come after the " https://app- ". "SJ" is for San Jose, "AB" is Ashburn, "E" is London, and "SN is Sydney The Regex you will use is as follows: San Jose datacenter- "munchkin_id.(\d+.) *\d+@em-sj-77.mktomail.com " London datacenter- "munchkin_id.(\d+.) *\d+@eu-lon-188.mktomail.com " Ashburn datacenter- "munchkin_id.(\d+.) *\d+@potomac1050.mktomail.com " Sydney datacenter - "munchkin_id.(\d+.) *\d+@snsmtp.mktomail.com " Replace "munchkin_id" with the Munchkin ID for your Marketo instance. This operates as the unique identifier to allow only email from your Marketo through the block. Other email from the "mktomail.com" domain will still be blocked. Is this article helpful ? YesNo
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Issue Description You have a lead that is marked as Email Suspended and you are not sure whether they can receive Marketo emails or not.   Issue Resolution When emails bounce as spam, the lead that bounced is set to "Email Suspended." "Email Suspended" is a historical field.  A more accurate name for this field would probably be "This email was suspended at some point in its history."  The actual suspension only lasts 24 hours. To see if the lead is currently suspended, check the timestamp on the 'Email Suspended' field.  If it is more than 24 hours ago, the lead is not currently suspended and can receive email from your Marketo instance.  However, the "Email Suspended" flag will remain on the lead record for the purposes of future troubleshooting.  It is not possible to set "Email Suspended" to "false" once it has been set to "true."  The "Email Suspended Cause" field will provide the bounce message associated with the most recent spam bounce. Is this article helpful ? YesNo
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Syntax Recommendations Common Look Up mechanisms a: mx: include: ip4: ip6: exists: ptr: all Common Modifiers redirect= exp= An A Record must ALWAYS contain IP address (map host to IP) CNAME (Alias) must contain hostnames. No IPs here NS an MX records must contain host names. No IPs allowed. MX records (for mail servers)  should contain hostnames NOT IPs. Too Many Mechanisms Section 10.1, "Processing Limits" of the SPF RFC 4408 specifies the following in regards to DNS lookups: SPF implementations MUST limit the number of mechanisms and modifiers that do DNS lookups to at most 10 per SPF check, including any lookups caused by the use of the "include" mechanism or the "redirect" modifier.  If this number is exceeded during a check, a PermError MUST be returned.  The "include", "a", "mx", "ptr", and "exists" mechanisms as well as the "redirect" modifier do count against this limit.  The "all", "ip4", and "ip6" mechanisms do not require DNS lookups and therefore do not count against this limit. The "exp" modifier does not count against this limit because the DNS lookup to fetch the explanation string occurs after the SPF record has been evaluated. This limit is in place to prevent SPF lookups from being a useful avenue for Denial of Service attacks. Using an example SPF record as an example to illustrate, this record was breaking with 12 look-ups: example.com text = "v=spf1 include:_spf-a.example.com include:_spf-b. example .com include:_spf-c. example .com include:_spf-ssg-a. example .com include:spf-a.another example .com ip4:131.107.115.215 ip4:131.107.115.214 ip4:205.248.106.64 ip4:205.248.106.30 ip4:205.248.106.32 ~all" [ 5 mechanisms] _spf-a.example.com   text = "v=spf1 ip4:216.99.5.67 ip4:216.99.5.68 ip4:202.177.148.100 ip4:203.122.32.250 ip4:202.177.148.110 ip4:213.199.128.139 ip4:213.199.128.145 ip4:207.46.50.72 ip4:207.46.50.82 a:mh. example .m0.net ~all"  [ +1 = 6 mechanisms] mh.example.m0.net a = 209.11.164.116 _spf-b.example.com text = "v=spf1 include:spf.messaging.example.com ip4:207.46.22.35 ip4:207.46.22.98 ip4:207.46.22.101 ip4:131.107.1.27 ip4:131.107.1.17 ip4:131.107.65.22 ip4:131.107.65.131 ip4:131.107.1.101 ip4:131.107.1.102 ip4:217.77.141.52 ip4:217.77.141.59 ~all" [+1 = 7 mechanisms] spf.messaging.example.com text = "v=spf1 include:spfa.another example .com include:spfb.anotherexaple.com include:spfc.anotherexample.com -all"  [+3 = 10 mechanisms] spfa.anotherexample.com   text = "v=spf1 ip4:157.55.116.128/26 ip4:157.55.133.0/24 ip4:157.55.158.0/23 ip4:157.55.234.0/24 ip4:157.56.112.0/24 ip4:157.56.116.0/25 ip4:157.56.120.0/25 ip4:207.46.100.0/24 ip4:207.46.108.0/25 ip4:207.46.163.0/24 ip4:134.170.140.0/24 ip4:157.56.110.0/23 -all" [+0 = 10 mechanisms] spfb.anotherexample.com   text = "v=spf1 ip4:207.46.51.64/26 ip4:213.199.154.0/24 ip4:213.199.180.128/26 ip4:216.32.180.0/23 ip4:64.4.22.64/26 ip4:65.55.83.128/27 ip4:65.55.169.0/24 ip4:65.55.88.0/24 ip4:94.245.120.64/26 ip4:131.107.0.0/16 ip4:157.56.73.0/24 ip4:134.170.132.0/24 -all" [+0 = 10 mechanisms] spfc.anotherexample.com   text = "v=spf1 ip4:207.46.101.128/26 ip6:2a01:111:f400:7c00::/54 ip6:2a01:111:f400:fc00::/54 ip4:157.56.87.192/26 ip4:157.55.40.32/27 ip4:157.56.123.0/27 ip4:157.56.91.0/27 ip4:157.55.206.0/24 ip4:157.55.207.0/24 ip4:157.56.206.0/23 ip4:157.56.208.0/22 -all" [ +0 = 10 mechanisms] _spf-c.example.com   text = "v=spf1 ip4:203.32.4.25 ip4:213.199.138.181 ip4:213.199.138.191 ip4:207.46.52.71 ip4:207.46.52.79 ip4:131.107.1.18 ip4:131.107.1.19 ip4:131.107.1.20 ip4:131.107.1.48 ip4:131.107.1.56 ip4:86.61.88.25 ip4:131.107.1.44 ip4:131.107.1.37 ~all" [+0 = 10 mechanisms] _spf-ssg-a.example.com   text = "v=spf1 include:_spf-ssg-b.example.com include:_spf-ssg-c. example .com ~all"  [+2 = 12 mechanisms] _spf-ssg-b.example.com   text = "v=spf1 ip4:207.68.169.173/30 ip4:207.68.176.1/26 ip4:207.46.132.129/27 ip4:207.68.176.97/27 ip4:65.55.238.129/26 ip4:207.46.222.193/26 ip4:207.46.116.135/29 ip4:65.55.178.129/27 ip4:213.199.161.129/27 ip4:65.55.33.70/28 ~all"  [+0 = 12 mechanisms] _spf-ssg-c.example.com text = "v=spf1 ip4:65.54.121.123/29 ip4:65.55.81.53/28 ip4:65.55.234.192/26 ip4:207.46.200.0/27 ip4:65.55.52.224/27 ip4:94.245.112.10/31 ip4:94.245.112.0/27 ip4:111.221.26.0/27 ip4:207.46.50.221/26 ip4:207.46.50.224 ~all" [+0 = 12 mechanisms] spf-a.secondexample.com   text = "v=spf1 ip4:157.55.0.192/26 ip4:157.55.1.128/26 ip4:157.55.2.0/25 ip4:65.54.190.0/24 ip4:65.54.51.64/26 ip4:65.54.61.64/26 ip4:65.55.111.0/24 ip4:65.55.116.0/25 ip4:65.55.34.0/24 ip4:65.55.90.0/24 ip4:65.54.241.0/24 ip4:207.46.117.0/24 ~all" [+0 = 12 mechanisms] Character String Too Long 255 character limitation in a single string https://kb.isc.org/article/AA-00356/0/Can-I-have-a-TXT-or-SPF-record-longer-than-255-characters.html http://www.string-functions.com/length.aspx You may have more than 255 characters of data in a TXT or SPF record, but not more than 255 characters in a single string. If you attempt to create an SPF or TXT record with a long string (>255 characters) in it, BIND will give an error (e.g. "invalid rdata format: ran out of space".)  Strings in SPF and TXT records should be no longer than 255 characters.  However to get around this limitation, per RFC 4408 a TXT or SPF record is allowed to contain multiple strings, which should be concatenated together by the reading application.  In the case of use for SPF (using either TXT or SPF RRs) the strings are concatenated together without spaces as described below.  Reassembly by other applications of multiple strings stored in TXT records might work differently. 3.1.3. Multiple Strings in a Single DNS record As defined in [RFC1035] sections 3.3.14 and 3.3, a single text DNS record (either TXT or SPF RR types) can be composed of more than one string. If a published record contains multiple strings, then the record MUST be treated as if those strings are concatenated together without adding spaces. For example: IN TXT "v=spf1 .... first" "second string..." MUST be treated as equivalent to IN TXT "v=spf1 .... firstsecond string..." SPF or TXT records containing multiple strings are useful in constructing records that would exceed the 255-byte maximum length of a string within a single TXT or SPF RR record. EXAMPLE text = "v=spf1 ip4:199.15.212.0/22 ip4:72.3.185.0/24 ip4:72.32.154.0/24 ip4:72.32.217.0/24 ip4:72.32.243.0/24 ip4:94.236.119.0/26  ip4:37.188.97.188/32 ip4:185.28.196.0/22 ~all“ text = "v=spf1 ip4:199.15.212.0/22“ " ip4:72.3.185.0/24 ip4:72.32.154.0/24 ip4:72.32.217.0/24" " ip4:72.32.243.0/24 ip4:94.236.119.0/26" " ip4:37.188.97.188/32 ip4:185.28.196.0/22 ~all" Null Records in the SPF Record A record that is NULL or that does not exist will break an SPF record.  Syntax within the record is very important, if there are extra spaces between mechanisms it will count as NULL. EXAMPLE text = "v=spf1 ip4:199.15.212.0/22 “ <- accurate text = "v=spf1 ip4: 199.15.212.0/22 “ <- NULL (NOTE the space between IP4: and the IP) Repetitive Records in the SPF Record - Void Lookups If there are too many repetitive mechanisms in the SPF record, including records that cascade (for example when using "include:") the record will break. There is a MAX of 2 void look ups in an SPF record.  More than that and the record will break.  This prevents SPF records from being used in Denial of Service style attacks. Validation Tools SPF checker, syntax validator and SPF tester http://www.kitterman.com/spf/validate.html SPF checker http://vamsoft.com/support/tools/spf-policy-tester SPF validator http://vamsoft.com/support/tools/spf-syntax-validator CIDR Calculator http://www.subnet-calculator.com/cidr.php Nslookup http://network-tools.com/nslook/ SPF creation wizard http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/ Common SPF errors http://www.openspf.org/FAQ/Common_mistakes SPF syntax definitions http://www.openspf.org/SPF_Record_Syntax
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What is the Golden Shield Project? The Golden Shield Project, commonly referred to as "The Great Firewall of China", is an initiative by the Chinese government designed to monitor and heavily censor all internet content. While most firewalls offer a protective shield around a corporation, Golden Shield places one around an entire country. Years in the making, the Golden Shield began operation in 2006. How does it affect me? If you are sending email to China, it will be subjected to significantly stricter email filtering than any other country in the world. This could result in email delays, delivered emails with unclickable links, or flat-out non-deliverability. What can I do to ensure email delivery? While there is no guaranteed way to ensure delivery (to anyone for that matter), there are some best practices you can follow that can improve deliverability when sending to China. Avoid commonly filtered content: Political and religious content aren’t only hot-button topics at dinner, they can also earn your email a one-way ticket to the spam folder. You should also refrain from using generic salutations, such as “Dear Friend.” In fact, don’t use the word “Dear” in your greeting at all. You should however consider using a first name token to personalize the greeting. Proper language: If you’re not fluent in Chinese, avoid using free online translation software. Incorrect or mangled grammar can result in your email getting discarded (note: this practice is applicable to all foreign languages). Pay the money for a good translation service. Be sure to use simplified Chinese characters as opposed to traditional. Mind your links: Marketo adds click-tracking to all links, allowing you to track the recipient’s actions. Due to the stringent filters in China, you’ll have better odds of links even working if you disable click-tracking (even when click-tracked links do work, their numbers are often inflated due to the extreme filtering practices). Additionally, if you ever have the option to purchase the top-level domain for China, (.cn), do it. The URL www.mysite.cn will have a better chance of loading than www.mysite.com. Font size: In terms of deliverability, font size matters. Anything below a 10-point font can be misconstrued as an attempt to sneak something in, thereby exposing the content to additional filtering. Keep a clean list: China is known for its high attrition rates when it comes to email lists. If an email address does not interact (open or click) with an email after 2-3 sends, it may be abandoned. Continuing to mail to this type of email address can have an adverse effect on your sending reputation, and subject you to further filtering. Contact Marketo for large qq.com sends: If you plan on mailing to a list north of 25k to qq.com, please contact Marketo Support so they can create a whitelisting request for our Privacy Team.  Sending from a dedicated IP is required for this request. How do I check if I am blacklisted in China? There are multiple sites that can give you this information. One we sometimes use is: http://www.blockedinchina.net/ . Be sure to check domains and sub-domains (if you use them). What can I do to get off the blacklist? Nothing at all, unfortunately.  Listing are often dynamic and will resolve on their own when reputation improves or the content is not flagged. Since I can’t do anything to be removed from the blacklist, what can I do to avoid landing on it going forward? Being blacklisted is only temporary 99% of the time (length of blacklisting will vary). Our best advice is to follow the above best practice tips. Is there anything else I should know? Countries such as China and Japan are huge players in the mobile market, so be sure to keep mobile best practices in mind when designing emails. Marketo cares about your success. To stay on top of trends, we monitor and receive reports from CASA (Chinese Anti-Spam Alliance). If you have any additional questions, or if you feel that you're being impacted by the Golden Shield, please contact Marketo Support.
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There are thousands of blacklists out there and all of them operate a little differently and all have varying levels of reputation.  There are only a dozen blacklists that really can impact delivery. The blacklist that requires the most work from you when you request delisting is Spamhaus. Spamhaus is a trustworthy blacklist and if you are listed at Spamhaus you have made a mistake that will need to be directly addressed before the listing can be removed. SpamCop is considered a tier one blacklist for B2B marketers but a tier 2 for B2B marketers.  Marketo responds to all SpamCop listings; researching to identify the source so we can work with the customer to educate on best practices and prevent future listings.  Some blacklists require that you pay a fee to be delisted. These blacklists are not favored in the email community because they use this tactic. For the most part, Marketo advises our customers not to mind alerts of being listed on a pay-to-delist blacklist.  These blacklists tend to have minimal impact to your deliverability . For the most part blacklists are dynamic and resolve themselves in around 24 hours if the issue resolves. If the problematic sending continues, of course, the blacklist will continue to keep you listed until the problematic sending ends. If you are blacklisted, your main concern at that point should be making sure it doesn't happen again. For steps on how to identify the problematic data source and improve your list hygiene in an effort to avoid blacklist issues, see our blacklist remediation article.
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On the Schedule tab of a Smart Campaign, you'll see a count of the number of leads who are blocked from receiving emails: Here are the reasons why your lead might be blocked from a mailing: Unsubscribed = True Email Invalid = True Marketing Suspended = True Blacklisted = True Email Address is empty Email suspended at in past 24 hours Leads that are blocked from mailings will run through the campaign's flow. However, these leads will be ignored any Send Email flow steps. They will execute all the other flow steps of the campaign. Note: If your Email is flagged as an Operational Email, Marketo will ignore the Unsubscribe and Marketing Suspended flags when running the Send Email step - but these leads will still count in the number blocked from mailings. Getting a list of all blocked leads First, set up a Smart List in your Lead Database to find all leads blocked from mailings as shown below. Make sure to set the list for ANY filter as highlighted below: To find leads were blocked in a campaign you already ran, filter for leads in the Leads Blocked From Mailings list you just built and members of that campaign: To find leads will be blocked in a campaign you are going to run, filter for leads in the Leads Blocked From Mailings and re-create the Smart List for your campaign:
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When using Marketo it is not a requirement to set up DNS text records for SPF and DKIM.  However, Marketo recommends setting up SPF and DKIM because it improves the deliverability of your mailings.  Configuring and implementing one or both of these records is a way to verify that the server sending your mail is authorized to do so. If a recipient domain is configured to check for SPF and/or DKIM and those DNS records are available and your mail passes the SPF/DKIM check, it further reinforces its good reputation.  Not implementing SPF/DKIM records does not add to or subtract from its reputation, it’s just not there. Please note, not all domains check for SPF/DKIM and if this is the case, again, the presence of these records does not add or subtract from your mail’s deliverability. There is no negative effect to setting up these records, and it can improve your deliverability.  It is for these reasons that Marketo recommends setting up these DNS records and configuring their use in your instance of Marketo. For more information on how to set up and configure SPF/DKIM, please read our KB article here.
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When a customer triggers a blacklisting on Marketo's shared IP range that customer is moved to a set of IPs we call the quarantined IP range.  We do this to protect the health of our shared network and ensure the best deliverability possible for all of our customers on that network. If you have received a Blacklist Notification from Marketo reporting that you have triggered a blacklisting your Marketo account is now in the quarantined IP range. While you are in the quarantined range it is possible that you may experience a slight decrease in your deliverability rates. The reason for this is that you are now sending from a range made up of senders that have also caused other blacklist issues. All customers have received a notice of the listing and are in the process of repairing their database. There are two ways to be removed from the quarantined IP range: Follow the steps outlined in our Blacklist Remediation article.  Be sure to fill out the form referenced in the email alert to indicate that you have taken steps to mitigate the issue. Demonstrate clean sending behavior for 3 months. We remove senders from the quarantined IP range if they have not triggered any new listings in 3 months. To ensure your best deliverability rates blacklist issues should be addressed right away to prevent further damage to your sending reputation.   Furthermore, if no action is taken to improve list hygiene the issue will likely recur. Marketo's Privacy Team strongly recommend following the Blacklist Remediation steps. Additional Resources: Blacklist Deep Dive​
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