On 16.01.2016 05:38, Natu wrote:
You don't say what yahoo's reject message is, ...
I guess it's possible that some users simply marked mailing list mails as spam and we got blacklisted because of that. The reject message is this: 421 4.7.1 [TS03] All messages from 5.9.250.164 will be permanently deferred; Retrying will NOT succeed. See https://help.yahoo.com/kb/postmaster/SLN3436.html
but I suspect you may be having issues with DMARC/DKIM and mailman's forwarding of DKIM signed messages.
I've finally gotten around to setting up and testing DMARC for my domain and I've set up mailman to munge From for DMARC messages. Sadly, I still haven't heard back from yahoo, but I guess their postmaster@ address really just goes to /dev/null. Too bad. I don't know when yahoo will start accepting mail again though and from a quick look at the log it seems that they always reject the mail directly at MAIL FROM time or don't even accept the connection/let it time out. That also means they will probably not notice that we've changed the configuration for DMARC mails. Thanks for your input I guess, but this will probably not be resolved any time soon.