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I agree that the human factor is much more significant than the possibility that an email security program might take exception to the mismatch.
And yes, I believe this would work for older email systems as well as current ones. I've not yet come across a situation where they were unable to use the regex header due to old technology.
Hello Gregoire,The regex return-path would be an alternative to the blanket listing of 'mktomail.com,' which is generic and whitelists all of Marketo rather than specific instances. The regex return-path header would look like this, though the domain would change based on the datacenter that hosts ...
Hello Gregoire,I can do a post addressing whitelisting options - I do think that would be useful. My short answer to people who are concerned about whitelisting a broad range of IP would be to whitelist the return-path instead. I address this briefly in this post, and I'm happy to answer questions...
There seems to be a lot of confusion about what these are and what they do, so I thought I would do a little post on it to try and clear it up. Let's look at CNAMEs first. CNAME is short for "canonical name" and if you look it up on Wikipedia, they define it like this: A Canonical Name record (abb...
It's not an uncommon case here in support - Marketo says the email was delivered, but the lead says they never got it. What happened? Because I love analogy here's how I think of it: Delivering email to a server is rather like delivering regular mail to a company. The post office doesn't come into...
There used to be an article in the old community about optimizing Smart List performance but I didn't write it. I don't think that old article is still around, but someone else wrote this, which covers pretty much the same information. Tips for Building Better Performing Smart Lists
Frequently people ask me for clarification on the different sorts of IPs Marketo offers, and the pros and cons of each, so I thought I would write a post on it, and since I love analogies, that's what I am going to do here.There are three kinds of IP that Marketo offers, shared, trusted, and dedicat...
In a previous post, I talked about troubleshooting hard bounces. In this one, I'm going to talk a bit about soft bounces, specifically soft bounces due to throttling.What is throttling?Throttling is an issue that occurs primarily with the large ISPs such as AOL, Yahoo, and Hotmail. When the ISPs a...
Let's say that you have a weekly newsletter that you send out through Marketo and every week your deliverability is 95% or better - except last week! Your deliverability was only 80%! What the heck happened!? To find out, we pull up a quick Email Performance Report for the email in question and se...