Smartermail is rejecting incoming emails with VERP style recipient addresses

Question asked by dean williams - 11/18/2021 at 10:18 PM

Unanswered

I'm using my Smartermail server to collect bounce messages. The incoming emails use a VERP plus style format user+bounce_unique_id@smdomain (with @smdomain being the Smartermail domain)

Smartermail is not delivering the bounce messages to user@smdomain. It is returning "550 No such user here" as it seems to be including the VERP string when attempting delivery.

2021.11.19] 12:39:50.295 [XX.XX.XX.XX][31179915] cmd: RCPT TO:<user+bounce_61972a9130b4a@smdomain.com> ORCPT=rfc822;user+2Bbounce_61972a9130b4a@smdomain.com
[2021.11.19] 12:39:50.295 [XX.XX.XX.XX][31179915] rsp: 550 <bounce+bounce_61972a9130b4a@smdomain.com> No such user here
[2021.11.19] 12:39:50.561 [XX.XX.XX.XX][31179915] cmd: RSET
[2021.11.19] 12:39:50.561 [XX.XX.XX.XX][31179915] rsp: 250 OK
[2021.11.19] 12:39:50.826 [XX.XX.XX.XX][31179915] cmd: QUIT
[2021.11.19] 12:39:50.826 [XX.XX.XX.XX][31179915] rsp: 221 Service closing transmission channel
[2021.11.19] 12:39:50.826 [XX.XX.XX.XX][31179915] disconnected at 19/11/2021 12:39:50 PM

From the Postfix MTA relay log (sending the bounce messages to Smartermail server):

postfix/smtp[185624]: A571A3F571: to=<user+bounce_6192143575613089061952@smdomain.com>, relay=mail.xxxxxxxx.com [XX.XX.XX.XX]:25, delay=0.02, delays=0.01/0.01/0/0, dsn=5.1.1, status=bounced (unknown user: "user")

Any ideas why this is occurring? Thanks!

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Gabriele Maoret - SERSIS Replied

11/19/2021 at 1:04 AM

You need to enable PLUS ADDRESSING in SmarterMail:

https://help.smartertools.com/smartermail/current/topics/user/plusaddressing.aspx

BE AWARE that if the bounce ID is different for every email, it will create a new folder for every single mail...

Gabriele Maoret - Head of SysAdmins and CISO at SERSIS Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

Gabriele Maoret - SERSIS Replied

11/20/2021 at 2:19 AM

I correct what I said before (I checked and I made a small mistake): if you activate the PLUS ADDRESSING you can also leave all the emails in the INBOX (see image below).

You can then set a rule in the user to move them to the folder you want based on the content.

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