[Mailman-Users] Bounce issues with Yahoo

[Greg Lindahl]

Yahoo is delaying delivery of mail from my domain because I look like
I'm spamming them -- my machine sends a lot of email to non-existent
Yahoo users. Well, that's because I get a lot of incoming spam from
fake Yahoo accounts to my Mailman, and I have it configured to send
back a "you aren't a member" message.

Is there any way to suppress "you aren't a member" only for Yahoo
senders?

-- greg