Using courier 0.38.2 on a Redhat Linux 7.1 machine and getting the following error every time I try to deliver something remotely or locally:

Jun 22 13:59:09 monster courieresmtpd: error,relay=::ffff:XX.XX.XX.XX,from=me...@xxx.com,to=th...@xxx.com: 431 Mail system full.

I've changed the email addresses and IP addresses in the above line.

My system has one partition and is mounted with plenty of space:

Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda1 2048000 588612 1459388 29% /

/dev/hda1 on / type ext2 (rw,usrquota,grpquota)

I've found some lines in submit.C that do this check and generate this error, but I can't figure out why my system would be failing that check.

The only strange thing I can think of is that my system is a Private Virtual Server (Ensim technology) so it's a virtual server running on a real hardware server which may also have other servers running on it. Sort of like VMware, but on a more robust scale. I have had absolutely no problems with any other application I've compiled on this system.

Thanks for your help.