Setting Up Sendmail To Mail System Messages On CentOS 6 And 7

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Hi all,

I’ve previously configured sendmail to send system messages on selected servers running CentOS 6. Usually they just kinda’ work out of the box. No problems to speak of.

However most of my CentOS 7-servers are rather flakey when it comes to sendmail. Most of the time they just won’t send mails for whatever reason. Further, most of the time I can get it working, it’s usually about a firewall rule not set, the firewall not having been reloaded or some simple such.

There is however this one server that just won’t play along. Daemons are up and restarted to pick up any changes, hostnames set etc. but still nothing. I’m at wits end with this one.

Here is a typical guide I’ve used for CentOS 6, and that I’ve used for the problem server above as well as for other CentOS 7-machines.

Is setting up sendmail different on CentOS 7 in any way, as compared to CentOS 6??
Anything else I should double-check?

5 thoughts on - Setting Up Sendmail To Mail System Messages On CentOS 6 And 7

  • Am 26.10.2018 um 14:44 schrieb Sorin Srbu:

    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.

    Not really.

    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).

    Alexander

  • Probably not helpful, but I run a home mailserver, always used sendmail. Spent 15 years slowly accumulating a functioning sendmail.mc. When I
    bring up a new system I just carry over the sendmail.mc, compile it, restart sendmail and voila. EL7 was no different than EL6 in that regard.

    Fred

    —
    —- Fred Smith — fredex@fcshome.stoneham.ma.us —————————–
    The eyes of the Lord are everywhere,
    keeping watch on the wicked and the good.
    —————————– Proverbs 15:3 (niv) —————————–

  • the

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

    Thanks.

    Gotcha’.

    This morning I found a 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 this.

    Thanks everybody for your assistance as well as suggestions!