​GNU MailMan is the email list software that both the SIG lists and the CAC-managed ​UW lists.

If you manage a list, by default messages that look like spam will be until you tell mailman what action to take. You will get a notice with a link to the list page and a message like:

Pending posts:
From: johntom_22@infinito.it on Sat Jul 29 04:39:16 2006
Subject: FROM JOHN TOM
Cause: Message has implicit destination

If you want to automatically discard held messages:

• Go to the list Admin interface
• Click on Privacy Options
• Click on Sender filters
  • near the top, set member_moderation_action to Discard
  • at the bottom, set generic_nonmember_action to Discard
  • set forward_auto_discards to Yes if you want to get a notice of discarded messages

Misc SysAdmin Tips

Creating a new mailing list:

/usr/lib/mailman/bin/newlist listname 
# add list aliases to /etc/aliases
newaliases

If you ever need to regenerate all archives for a mailing list, run:

/usr/lib/mailman/bin/arch listname

You can set the master password with

/usr/lib/mailman/bin/mmsitepass