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If you’re designing HTML emails (for instance, newsletters or other mails that are not created with a Mail User Agent), you will know that you have to use HTML 3.2 because of Outlook 2007 and its strange Word 2007 rendering. (By the way, I’d even extend Microsoft’s argument that Word is better for security reasons because it doesn’t understand scripts and suggest using Word 2007 as the default browser for every computer.)

In Word/Outlook 2007 Background images are only accepted in this format:… Continue Reading

Many people use AMaViS or amavisd-new to combine Postfix with ClamAV and SpamAssassin. However, Amavis takes huge amounts of CPU time and memory. Also, it’s quite slow and difficult to configure, so another solution without Amavis would be interesting.

In this article, I will only discuss server-wide solutions without procmail because it can’t be used with virtual domain mailboxes.

It’s possible to use a shell script that calls ClamAV and SpamAssassin as a Postfix content filter:

/opt/mail-scanner

#!/bin/sh

EX_OK=0
EX_BOUNCE=69
EX_DEFER=75

SENDMAIL=”/usr/sbin/sendmail -G -i”

SPAM_DIR=/home/mailscan/spam
VIRUS_DIR=/home/mailscan/viruses

function cleanup {
for fname in ${tmpfile[@]}
do
rm -f $fname
done
}

for ((i=0;i<2;i++))
do
fname=`mktemp -p /tmp mail-scanner.XXXXXXXX`
if [ “$?” != 0 ]; then
logger … Continue Reading