[CentOS] Setting up sendmail to mail system messages on CentOS 6 and 7

Mon Oct 29 06:39:48 UTC 2018
Sorin Srbu <sorin.srbu at ilk.uu.se>

> -----Original Message-----
> From: CentOS <centos-bounces at centos.org> On Behalf Of Alexander Dalloz
> Sent: den 26 oktober 2018 16:05
> To: centos at centos.org
> Subject: Re: [CentOS] Setting up sendmail to mail system messages on
> CentOS 6 and 7
> Am 26.10.2018 um 14:44 schrieb Sorin Srbu:
> > Here is a typical guide I've used for CentOS  6, and that I've used for
> > problem server above as well as for other CentOS 7-machines.
> > <https://www.jeffgeerling.com/blogs/jeff-geerling/configure-sendmail-
> centos>
> That "guide" is not really useful nor clever. In a scenario like yours,
> you would setup Sendmail as a nullclient. That's documented in
> cf/README. Or even drop Sendmail and choose a software like msmtp or
> ssmtp which is dedicated for such purpose. You don't need the MTA
> functionality of Sendmail.

I'll look those up. The suggestions makes a lot of sense.

> > Is setting up sendmail different on CentOS 7 in any way, as compared to
> > CentOS 6??
> Not really.


> > Anything else I should double-check?
> Your logs will tell you what is happening and where to look at closer.
> If you like to get specific help from this list I feel you should
> provide your sendmail.mc and log content demonstrating your issue(s).


This morning I found a <bleep>load of "This message hasn't been delivered
yet" mails in my inbox.
Turns out the central uni mail filter had intercepted all my test mails from
the very beginning.

Previous log messages stated the mails had been accepted for delivery from
the mail servers and I took their word for it.

What I missed was these messages that came in slightly later; "First-time
sender tempfailed as anti-spam measure; please try again in 720 minutes..."

I'll have a talk with the central support and see if they can't ease up on

Thanks everybody for your assistance as well as suggestions!