[rt-users] RT stop sending emails

[Joop]

Swart, Tom wrote:
> I have gone back to using msmtp and have an external SMTP relay defined.
> In the /var/log/mail.log file the only current entries are for the
> results of my auto fetchmail cronjob. There is results from yesterday
> when it was working but nothing from today.
>   
What you could try is see if msmtp has a -v (verbose) flag and manually 
send an email to see what the mailservers are telling each other. If it 
hasn't this then you could resort to:
telnet mailserver 25
And by hand do a conversation with it.
I've been having problems lately with Centos4.7 and its sendmail and 
each time it turned out that the other end didn't like my user at host.domain.
This being caused by the fact that host.domain didn't have a DNS entry 
in the wide world.
So using a couple of option within Sendmail (masqerading) fixed this.

You could have a look and see it you're not hit by this either.

Regards,

Joop