I got a centos machine that I am configuring send mail for. It has been working for the past couple of weeks. But around last week suddenly the sendmail stopped sending emails. var/log/maillog doesn't show any obvious errors. I tried the suggestions in the following post about changing the daemon option to not include the localhost as per post here:

Where to check log of sendmail?

but here is the thing: I got another identical server with the localhost included in the daemon option and that one is working fine.

I found that if I reboot the sendmail service it can start the queued mail messages.

Has anyone seen this before?


  • Can you please elaborate on the symptoms? When the issue occurs, does it stop sending all emails? Or just stop processing deferred/queued messages? Is the daemon listening on port 25 during this issue? What happens if you manually try connecting to the host via a telnet test? – Mike B Mar 16 '15 at 16:10
  • The symptom is just that the mail doesn't get sent, all messages does not get sent. It seems to hold it in queue/deferred and that's it. The daemon is listening on port 25. – D.Zou Mar 16 '15 at 19:37
  • 1
    What happens when you telnet to the system while the issue is occurring and try sending a message? How far in the SMTP transaction does it get? – Mike B Mar 16 '15 at 23:44

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