Building a serverless email delivery service on AWS

Re:Building a serverless email delivery service on AWS by tyingq on Thursday September 02, 2021 @03:57PM (#28396608)

Thanks...it does appear to handle the live SMTP bounces better than I thought, at least for hard, synchronous bounces that happen at SMTP delivery time: https://docs.aws.amazon.com/ses/latest/DeveloperGuide/send-e...

However, my experience was that you also had to do something with soft bounces. For example, if someone's mailbox is perpetually full, re-sending to it over and over still can still eventually hurt your sending reputation.

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Re:Building a serverless email delivery service on AWS by joawan on Friday September 03, 2021 @02:38AM (#28401089)

Yeah, SES puts those soft bounces on suppression list too after a number of failed attempts. That is actually an issue we've struggled with. A large number of users using a mail service with just 10MB of storage. Those mailboxes were always full and we got soft bounced over and over until SES put them on suppression list. User contacted support and got told to clean out the inbox to make room but emails could still not be delivered until we had manually remove the address from the suppression list.

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