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One of my many hats I wear at work is Email administrator. One of the toughest jobs I have is identifying mail loops that are eating up system resources. I found a great program here that did way more than I wanted, but it was written in C (powers that be wouldn't go for it). I also found this on CPAN, but it didn't do what I wanted. After performing a Super Search here, I decided to write my own. It is VERY unpolished. Ideas that someone else could use to make this a much better program are:

  • Provide ability to specify location of mail log
  • Clean up output (trailing commas, <>, etc)
  • Keep track of message size between pairs
  • Parse status messages (deffered, user unknown, etc)

    If anyone finds this useful and decides to implement any of those suggestions, let me know. For now, it is functional, but it can always be better.

    #!/usr/bin/perl -w use strict; open(SENDMAIL, "/var/adm/syslog/mail.log"); my %pairs; my %from; while (my $line = <SENDMAIL>) { chomp $line; my @fields = split(" ", $line); next if ( $fields[6] !~ /to=/ && $fields[6] !~ /from=/ ); if ( $fields[6] =~ /from=/ ) { $from{$fields[5]} = "\L$fields[6]"; } else { $pairs{"$from{$fields[5]} \L$fields[6]"}++; } } close(SENDMAIL); foreach my $key (sort {$pairs{$b} <=> $pairs{$a}} (keys(%pairs))) { print "$pairs{$key} $key\n"; }



    In reply to Sendmail pairs by Limbic~Region

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