Hello Henry, I am running my own email-server as well and can connect to t-online. I assume Viktor is right that they somehow check the imprint of a parallel web site. My website does not indicate I am offering email service commercially, which in fact I do only to organizations I know personally. I did get blocked by Outlook though and changed ip address to resolve that. Your data center might be suspect to them. You may want to try a VPN to a different one that has better reputation. Btw - what "encryption" are you doing? Regards, Joachim
-----Ursprüngliche Nachricht----- Von: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> Im Auftrag von Viktor Dukhovni Gesendet: Mittwoch, 30. November 2022 07:55 An: postfix-users@postfix.org Betreff: Re: how to deal with t-online's blocking On Wed, Nov 30, 2022 at 02:08:57AM +0000, Henry R wrote: > But t-online.de keep blocking me. I have contacted them twice and got the > same answer: > > We only allow evidently commercial or similar operators to connect > to our mailservers. So, as a private user please use an SMTP relay > or e-mail gateway of your hoster or ISP, that you can use as part > of your contract with them. Their support will surely help you to > configure your system accordingly. > > That's so strange policy to permit only commercial company to send > messages to them. But there are many small companies/org who have > their own mailservers, which can't send messages to t-online directly. Most likely this is not their actual policy, but rather a way for some underpaid level-1 tech support staffer to close your issue. See https://postmaster.t-online.de/#t4 for what appear to be the actual requirements. They do appear to expect sending domains to have a website, public contact addresses, ... but a requirement to be a commercial operator isn't there, best I can tell. You could try to escalate after politely pointing to the above page and pointing out that it does not in fact prohibit suitably operated personal mail servers. -- Viktor.
