Tag Archives: blacklist

Adding a sender blacklist to Postfix

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Here at ProgClub, as moderator for our mailing lists, I get a bunch of spam that I have to get rid of every day, to keep our lists sparkling and spam-free. I regularly get spam from senders from ofenews.co.uk, and I wanted to add their entire domain to a blacklist on our mail server… I hadn’t configured a Postfix blacklist before, so I did a little research and came up with this:

I created a file /etc/postfix/sender_access like this:

ofenews.co.uk REJECT

Then I created the access database:

# postmap /etc/postfix/sender_access

Then I added the sender restrictions into /etc/postfix/main.cf:

smtpd_sender_restrictions =
  check_sender_access hash:/etc/postfix/sender_access

Then I restarted postfix and was done! Everything is easy when you know how.

For reference, here is the doco which I read to help me:

SpamAssassin whitelist and blacklisting

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Today I figured out how to specify whitelist and blacklist email addresses in SpamAssassin.

At the end of /etc/spamassassin/local.cf I added two lines:

include whitelist
include blacklist

Then in the /etc/spamassassin/whitelist file I added some email specifications, e.g.:

jj5@sixsigma:~$ cat /etc/spamassassin/whitelist
# Allow email from system services, e.g. from
# logwatch@hope.progclub.net or root@charity.progclub.org
whitelist_from *@*.progclub.*
# Similarly for blackbrick:
whitelist_from *@*.blackbrick.com

The /etc/spamassassin/blacklist file exists and is ready to go, but I haven’t blacklisted anything yet:

jj5@sixsigma:~$ cat /etc/spamassassin/blacklist
# No email addresses blacklisted yet.
#blacklist_from someone@example.com

Too easy.

There’s some more information on Whitelising a user.

At some point I hope to write a script that processes my users’ maildirs and whitelists everyone they’ve emailed.