Backports.org has released backports of Mozilla 1.6, MySQL 4.0.17, and Postfix 2.0.18 for Debian GNU/Linux 3.0

Here the apt sources:

# Mozilla 1.6
deb http://www.backports.org/debian stable mozilla
deb-src http://www.backports.org/debian stable mozilla

# MySQL 4.0.17
deb http://www.backports.org/debian stable mysql-dfsg
deb-src http://www.backports.org/debian stable mysql-dfsg

# Postfix 2.0.18
deb http://www.backports.org/debian stable postfix
deb-src http://www.backports.org/debian stable postfix