debian etch + exim4 + greylistd + spf
Today I’ve spent some time implementing greylisting on our smtp server continuing my endless fight against UCE (spam). Setting this up is as easy as running “aptitude install greylistd” and adding to the exim.conf: defer message = $sender_host_address is not yet authorized to deliver \ mail from <$sender_address> to <$local_part@$domain>. \ Please try later. [...]