I assume you are referring to random postings vs. an adversary targeting you specifically.
An internet-facing mail server has to have some anti-spam technology <https://en.wikipedia.org/wiki/Anti-spam_techniques#Confirmed_opt-in_for_mail...>. Email addresses out on public web pages will get hoovered up and added to spam lists. The server will soon be hit by botnets from around the world. By default Mailman lists the posting address of the mailing list. Expect spam!
If you are being hit by spam then you should stop it before your server accepts the incoming mail. Once mail is accepted on your system you have lost half the battle. Either discard unwanted posts or risk back scatter. As you noted it takes work in Mailman to handle general spam.
May I suggest creating a web page with addresses to serve as a honeypot on your server. Then you know everything sent to those addresses are junk. I learned a lot by using that trick.
Ciao, //Z\\ Jim Ziobro On 1/19/2019 4:58 PM, Kenneth G. Gordon wrote:
One of my forums has suddenly been inundated with posts to the list by non-subscribers, most of which seem to be coming from some homosexual list somewhere.
These seem to be coming from every place in the world.
I receive notices from Mailman every time I check my e-mail listing of 4 to a dozen non-subscribers attempting post to the forum, and I have to go to my admin database and remove and block each one.
Is there some way to prevent these jerks from showing up in the database at all?
Ken Gordon
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