On 2014-12-26 12:39 pm, Robert G. (Doc) Savage wrote:
I'm using fail2ban with CentOS 6.6. Something is causing fail2ban's alerts sent to root's mail to be rejected. Here's a clip from one of the error messages:
Message 48: From MAILER-DAEMON@lion.protogeek.org Sun Dec 21 03:09:20 2014 Return-Path: <MAILER-DAEMON@lion.protogeek.org> Date: Sun, 21 Dec 2014 03:09:19 -0600 From: Mail Delivery SubsystemMAILER-DAEMON@lion.protogeek.org To: postmaster@lion.protogeek.org Content-Type: multipart/report; report-type=delivery-status; boundary="sBL97EKS003880.1419152959/lion.protogeek.org" Subject: Postmaster notify: see transcript for details Auto-Submitted: auto-generated (postmaster-notification) Status: R
Part 1: The original message was received at Tue, 16 Dec 2014 03:09:17 -0600 from localhost with id sBG97E83025627 ----- The following addresses had permanent fatal errors ----- <fail2ban@example.com> ----- Transcript of session follows ----- <fail2ban@example.com>... Deferred: Connection timed out with example.com. Message could not be delivered for 5 days Message will be deleted from queue ..........I used to get the messages that are now being deleted after five days. Any suggestions?
I would suggest looking at the mailer daemon logs on both the sending and receiving systems. It would appear that the sending system is having difficulties at the receiving system end.
You will likely find the root of your issues in the log entries for that message (or those messages) that occurred over the 5 days in question.