Am Donnerstag, den 27.08.2020, 09:21 +0200 schrieb Felix Zielcke via mailop: > Am Donnerstag, den 27.08.2020, 09:02 +0200 schrieb Renaud Allard via > mailop: > > Does this mean that if you send a mail for "u...@domain.com" from > > the > > server "mail.example.com" with a correct FCrDNS, it will be denied > > because domains don't match? > > If yes, this is the most stupid idea ever, as this cannot work for > > shared mail hosting. Or maybe they have done exceptions for things > > like > > o365 or gmail servers. > > No. > Deutsche Telekom uses a whitelist which IPs can send mails to @t- > online.de accounts. They block every IP by default. > > So if you got some cloud vm with a new IP address, which never before > sent mail to a @t-online.de address, mails will be rejected. > You need to write their postmasters so it gets added to their > whitelist. And for this process you need to have a small web page > with > your personal address listed if your server is run privately. > >
To make it a bit more clear: The domain of the PTR of your MTA sending IP counts. Not the one in the From Header of your emails. If you got once your sending IP whitelisted, it doestn't matter how many domains you run on it. And if they have a web page or not. _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
