I run a cPanel system that, among other things, supports about 300
Mailman lists. We have about 20,000 users. I am getting lots of
bounced messages from roadrunner.com and various XXX.rr.com domains.
It looks like they may be blocking my domain nfbnet.org although I am
not sure how you tell.
When I look at a mail delivery report via cPanel, I see messages that
say 421 too many concurrent connections, connection refused. What
can I change to fix this problem!
Thanks!
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