Bounced Emails

[Tridev]

Hi all!
I wanted to know by default does Marketo have any retry mechanism for the soft bounced as well as the hard bounced emails. I am aware that we can have a bounce management program created but wanted to be aware if Marketo has some default retry mechanism in place?

[Darshil_Shah1]

From what I know of Marketo like most other senders, does re-try sending the failed deliveries. The failed messages remain in the queue for ~24-36 hours during which the sender attempts to deliver the message at a multiplicatively decreasing rate (i.e., after every failed try, the Exponential backoff algorithm waits longer than before for retrying).

[Tridev]

Ahh thanks! Have my query cleared.

[SanfordWhiteman · Accepted solution]

Like Darshil says, for temporary errors there's a backoff algorithm. It looks like this (this is from actual Marketo sends):

However, this does not apply to immediate bounces. A hard error due to a nonexistent user (at a domain that can otherwise receive email) will not retry, by definition.

[Tridev]

Thanks! This definitely helps!!

[Katja_Keesom]

The guys are of course 100% right. When you look at your email performance report, you will see a column "Pending". The number of people shown there are the ones where retries are still in progress. You will see that indeed after a day or two this column will be reduced to 0.