In Marketo, when an email is sent to an address and is returned as undeliverable, this is known as a bounce. Bounces can occur for a variety of reasons, such as an invalid email address or an email server being down. Marketo categorizes bounces into two main types:
Hard Bounces: These are permanent delivery failures, such as bounces are emails that have been marked as spam by the recipient mail server.
Soft Bounces: These are temporary delivery failures, such as when an email server is down or the recipient's inbox is full. Soft bounces are generally caused by a temporary error, and the email may be delivered later.
In addition to these two main categories, Marketo also allows for additional specific types of bounces:
Block Bounces: These are bounces caused by the email being blocked by an organization's email security gateway, for example for the email containing some unwanted content
Challenge response Bounces: These are bounces caused by a recipient's email client responding with a challenge, or request for confirmation, before accepting the email
It's important to monitor bounces and take appropriate action, such as removing invalid email addresses from your list or resending the email later. By keeping track of bounce rates and identifying the cause of the bounces, you can improve your email deliverability and ensure that your messages are reaching the right people.
Marketo allows you to download a bounce report, which you can use to identify the specific email addresses that bounced, the reason for the bounce, and the number of bounces per type. With this information, you can identify patterns and make the necessary changes in your email strategy. Also
Hard Bounces
Hard Bounces come in two types, Category 1 and Category 2.
Category 1 Many email servers monitor blacklists or junk mail traps, so after de-listing with them, leads that have had a Category 1 bounce earlier may additionally be capable to get hold of emails again.\
Category 2 bounces occur due to an email address that is invalid or doesn’t exist.
Soft Bounces
Soft Bounces come in three different types, Categories 3, 4 or 9.
Category 3 bounces are normally temporary,triggeredby usingfull mailboxes, timeouts, or throttling. Any email with this designation has been retried for up to 24 hours .
Category 4 bounces arebrought onviatechnical problems, Transient Failures, Admin Failures, DNS Failures. Anye-mailwith this designation has been retried for up to 24 hours .
Category 9 bounces are unknown, undetermined or gibberish details. Any email with this designation has been retried for up to 24 hours. Aditionall you can refer to this Maintaining a Directory of Leads Bouncing Emails
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