Blogs are like opinions. Everybody has one…

Due to a customer having being stuck with a virus I found out this today:

http://www.secsup.org/complaints/

So I added these lines in our outgoing mail servers' sendmail.mc (for the future):

#Remember that sendmail distinguishes between LHS and RHS with TABS not spaces
LOCAL_CONFIG
F{MCI_DOMAINS} -o /etc/mail/mci-domains

LOCAL_RULESETS
SLocal_check_rcpt
R$*         $: $>canonify $1
R$- < @ $={MCI_DOMAINS} . > $*       $#error $@ 5.1.3 $: "Cannot send mail there.  See http://www.secsup.org/complaints/"

with /etc/mail/mci-domains containing:

mcimail.com
internetmci.com
networkmci.com
internetmci.net
networkmci.net