[CentOS] Postfix (I think) problem

[Alexander Dalloz]

Am 24.01.2015 um 16:10 schrieb Timothy Murphy:
> I'm getting repeated email (KMail) error messages
> about one apparently over-large post:
> --------------------------
> Received: from helen.gayleard.com (localhost.localdomain [127.0.0.1]) by
> helen.gayleard.com (Postfix) with ESMTP id E4500294A0 for
> <tim at helen.gayleard.com>; Sat, 24 Jan 2015 14:00:05 +0000 (GMT)
> Received: (from tim at localhost) by helen.gayleard.com (8.14.4/8.14.4/Submit)
> id t0OE02Ie006372; Sat, 24 Jan 2015 14:00:02 GMT
> Date: Sat, 24 Jan 2015 14:00:02 +0000
> X-Authentication-Warning: helen.gayleard.com: tim set sender to root using -
> f

That's Sendmail, NOT Postfix!

> From: Cron Daemon <root at helen.gayleard.com>
> To: tim at helen.gayleard.com
> Subject: Cron <tim at helen> /usr/bin/fetchmail -s mail.eircom.net
>
> fetchmail: SMTP error: 552 5.3.4 Message size exceeds fixed limit
> fetchmail: mail from MAILER-DAEMON at helen.gayleard.com bounced to
> biblioteca at comune.anghiari.ar.it
> --------------------------
> I've appended
>    mailbox_size_limit = 20000000
> to /etc/posfix/main.cf (and re-started postfix)
> but this does not seem to have done the trick.

main.cf doesn't matter because Sendmail is the MTA acting here.

> I get this email by fetchmail, and it goes to dovecot
> from which I retrieve it on my laptop.
> So I'm not entirely clear where the problem occurs.
>
> I would delete the email if I could find it,
> but it does not appear to be in my Maildir, or in /var/spool/ .
>
> Is there some way I can stop these messages, please?

See above comments. If you want to run Postfix instead of Sendmail, then run

alternatives --config mta

and set Postfix to be the active MTA.

Alexander