On Mon, Sep 09, 2024 at 05:14:07PM +0200, Håkon Alstadheim via Postfix-users
wrote:
> I got the attached report about a double bounce from my incoming postfix
> server "Postfix SMTP server: errors from
> nullbounce.com[116.202.14.127]:57394".
This wasn't a double-bounce, just an invalid SMTP recipient. Rather,
your Postfix configuration sends detailed postmaster notices about
fairly routine events (errors). Personally, I don't enable such
notices. The default is:
notify_classes = resource, software
> When I realize that this error is totally bogus, I want to blackhole
> that whole netblock.
An overreaction IMHO. Just turn off the notifications.
> I see a double bounce, my heart jumps, I'm thinking "have I messed up
> my config?". I do NOT want bogus error-notifications.
See above.
> From: Mail Delivery System <mailer-dae...@incoming.alstadheim.priv.no>
> Date: Mon, 9 Sep 2024 05:03:30 +0200 (CEST)
> Subject: Postfix SMTP server: errors from
> nullbounce.com[116.202.14.127]:57394
> To: Postmaster <postmas...@alstadheim.priv.no>
>
> Transcript of session follows.
>
> Out: 220 incoming.alstadheim.priv.no ESMTP Postfix (Debian/GNU)
> In: EHLO nullbounce.com
> Out: 250-incoming.alstadheim.priv.no
> Out: 250-PIPELINING
> Out: 250-SIZE 512000000
> Out: 250-VRFY
> Out: 250-ETRN
> Out: 250-STARTTLS
> Out: 250-ENHANCEDSTATUSCODES
> Out: 250-8BITMIME
> Out: 250-SMTPUTF8
> Out: 250 CHUNKING
> In: RSET
> Out: 250 2.0.0 Ok
> In: MAIL FROM:<i...@nullbounce.com>
> Out: 250 2.1.0 Ok
> In: RCPT TO:<bent.jorgen...@alstadheim.priv.no>
> Out: 550 5.1.1 <bent.jorgen...@alstadheim.priv.no>: Recipient address
> rejected: User unknown in local recipient table
> In: QUIT
> Out: 221 2.0.0 Bye
Completely routine delivery failure to a non-existent address, not worth
your or anyone else's time. Just leave such traces in the logs, for
the rare case when you're troubleshooting inbound delivery issues.
--
Viktor.
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