An email to a disabled account in a domain alias is accepted via SMTP and then generates a bounce at delivery

Problem reported by josh levine - 1/4/2025 at 1:14 AM

Submitted

These messages should instead get rejected during the SMTP transaction.

This is a particularly bad issue because incoming emails to disabled accounts are often spam from fake or compromised addresses so these bounces end up cascading.

Note that this issue is different from the one reported here which has since been fixed...

https://portal.smartertools.com/community/a96555/looks-like-sm-will-accept-message-disabled-account-over-smtp-then-generate-an-outgoing.aspx

I am running SmarterMail Professional 100.0.9084.26965 (Nov 14, 2024).

Tony Scholz Replied

1/7/2025 at 9:27 AM

Employee Post

Hello Josh,

The reason you are seeing this is that the Alias address ( Mailing List address as well ) is not expanded untill the message hits the Delivery Thread after being accepted by the SMTP thread.

I can submit a Feature Request to adjust how these are handled.

Thank you

Tony Scholz System/Network Administrator SmarterTools Inc. www.smartertools.com

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