Brain Goo

If you have WordPress installed you may run in to an error that constantly prints something like this:
Warning: Unknown: Releasing SysV semaphore id 58 key 0×152b in request cleanup in Unknown on line 0

This is not an error from WordPress, but from the WP Super Cache Plugin you forgot you installed. The error [...]

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How to set up virtual email domains and users with POP access on Debian Sarge
http://www.randomsequence.com/articles/smtp-pop3-email-for-virtual-users-on-debian-sarge/
Adverts:
The Exim SMTP Mail Server
Exim: The Mail Transfer Agent
The Exim SMTP Mail Server: Official Guide for Release 4

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How to set up virtual domain hosting in Postfix.
http://www.postfix.org/VIRTUAL_README.html

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