[Mailman-Users] Trouble with mailman external responses

Paul Tomblin ptomblin at xcski.com
Wed Mar 7 17:24:01 CET 2007

Quoting Mark Sapiro (msapiro at value.net):
> Paul has addressed your main question. I just want to add that you may
> have problems trying to run Mailman from a server with a dynamic IP.
> Earthlink.net for one will not accept your mail. The same is true for
> some smaller ISPs. They don't like IPs with a 'generic' rDNS.

The biggest problem I had when I was doing a mailman list on my home
server was that many sites would refuse email from IPs that were on their
RBLs list of dynamic IPs.  Yes, some of them look for a valid rDNS, but
99.99% of them were perfectly happy with an rDNS of
"74-202-84-132.static.twtelecom.net" rather than "list.xcski.com".

I tried to get around that by sending my outgoing mail through my ISP's
outgoing mail server (using Postfix's "relayhost =
[smtp-server.rochester.rr.com]"), but then my ISP wouuld decide I'd sent
enough mail for that day and block me for 24 hours.  For a while I was
using a friend's box on a colo facility for a relayhost, but eventually I
moved my lists to first a Virtual Private Server at linode.com, and then
to my own colo box.

Paul Tomblin <ptomblin at xcski.com> http://blog.xcski.com/
IMAP is just not a very rich protocol.
              -- Steve Conn, Exchange Server product manager for Microsoft

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