How do I check the postfix queue size?

Solution 1:

Or, less typing:

mailq

Solution 2:

qshape active

will show you the number of emails being sent to each domain and how long they have been in the active queue

qshape deferred 

will show you the same but for the deferred queue

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Solution 3:

postqueue -p

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Solution 4:

Here's what I use, culled from the postfix mailing list. I removed the author's name, in case he doesn't want it here (you can see it at the source). It only displays totals.

#!/usr/bin/env perl

# postfix queue/s size
# author: 
# source: http://tech.groups.yahoo.com/group/postfix-users/message/255133

use strict;
use warnings;
use Symbol;
sub count {
        my ($dir) = @_;
        my $dh = gensym();
        my $c = 0;
        opendir($dh, $dir) or die "$0: opendir: $dir: $!\n";
        while (my $f = readdir($dh)) {
                if ($f =~ m{^[A-F0-9]{5,}$}) {
                        ++$c;
                } elsif ($f =~ m{^[A-F0-9]$}) {
                        $c += count("$dir/$f");
                }
        }
        closedir($dh) or die "closedir: $dir: $!\n";
        return $c;
}
my $qdir = `postconf -h queue_directory`;
chomp($qdir);
chdir($qdir) or die "$0: chdir: $qdir: $!\n";
printf "Incoming: %d\n", count("incoming");
printf "Active: %d\n", count("active");
printf "Deferred: %d\n", count("deferred");
printf "Bounced: %d\n", count("bounce");
printf "Hold: %d\n", count("hold");
printf "Corrupt: %d\n", count("corrupt");

EDIT: Fixed a typo on line 26.

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Solution 5:

postqueue -p | tail -n 1

Last line in the postqueue -p shows how many requests and size:

-- 317788 Kbytes in 11860 Requests.