On Fri, December 26, 2014 12:59, Mike Burger wrote: > 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 at lion.protogeek.org Sun Dec 21 03:09:20 2014 >> Return-Path: <MAILER-DAEMON at lion.protogeek.org> >> Date: Sun, 21 Dec 2014 03:09:19 -0600 >> From: Mail Delivery Subsystem >> <MAILER-DAEMON at lion.protogeek.org> >> To: postmaster at 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 at example.com> >> >> ----- Transcript of session follows ----- >> <fail2ban at 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. > Just checking the obvious but can you confirm that you are not actually sending messages to example.com? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3