If you see a large mail queue and your system’s I/O is increasing, you may find messages like these in your syslog:
Losing q5/qfg9N5EwE3004499: savemail panic
SYSERR(root): savemail: cannot save rejected email anywhere
In this situation, there’s some reason why sendmail cannot deliver e-mail to the postmaster address. There’s a few issues that can create this problem:
Missing [...]
One of my biggest complaints on RHEL 4 is the large resource usage by the version of SpamAssassin that is installed. When it runs, it uses a ton of CPU time and causes a lot of disk I/O as well. When running top, you may see multiple spamd processes. For a high-volume [...]
If you have a new Plesk installation and the following option is greyed out in Server -> Mail:
Switch on spam protection based on DNS blackhole lists
Just install the following RPM from Plesk:
psa-qmail-rblsmtpd
I stumbled upon this peculiar bounce message recently while working on a server:
Hi. This is the qmail-send program at yourmailserver.com.
I’m afraid I wasn’t able to deliver your message to the following addresses.
This is a permanent error; I’ve given up. Sorry it didn’t work out.
<user1@domain.com>:
This message is looping: it already has my Delivered-To line. (#5.4.6)
— Below [...]
You may catch this error when you attempt to start dovecot on a Red Hat Enterprise Linux 5.1 system with the 64-bit architecture:
dovecot: imap-login: imap-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory
dovecot: pop3-login: pop3-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared [...]
