Mailman
The other night I installed mailman on my server. I integrated it into the apache configuration and restarted that. The mailman web interface became available as expected.

I used the web interface to subscribe to the one list I had set up and I received an email asking me to confirm my subscription. I went to the included link, and all seemed to be good.

Another person joined the list successfully, then sent an email to the list. This email never arrived in her inbox. She told me about it, and I checked only to find I did not have a copy either. I sent a mail to the list and promptly received a message saying that [listname] was not a valid recipient at the domain.

That's when I realized I had forgotten to tell the mail server (postfix) about mailman. I had told apache about mailman, and mailman about postfix, but not postfix about mailman.

I used mailman to create an alias database for its single list, then updated postfix's configuration to use that as one of its alias maps. All seems to be working now.

In conclusion, I learned two things. One is always test your configuration before telling people it's ready. The other is, "I'm an idiot."

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