Alright so bear with me as I am surprised I even got this far in troubleshooting.

So I am using port 26 as my default frontend on exchange instead of 25 since my ISP blocks it. So I port forwarded port 26 and also opened it inbound on Windows firewall. Still don't receive any emails. I went through the logs and found this however I'm not sure what I am doing wrong.

2022-08-17T04:07:53.372Z,JOEY-MAIL-1\Default Frontend MAIL-1,08DA7FFA9DB31967,1,192.168.1.10:26,107.161.27.201:55253,>,"220 MAIL-1.mydomain.com Microsoft ESMTP MAIL Service ready at Wed, 17 Aug 2022 00:07:52 -0400",
2022-08-17T04:07:53.431Z,MAIL-1\Default Frontend MAIL-1,08DA7FFA9DB31967,2,192.168.1.10:26,107.161.27.201:55253,-,,Remote(SocketError)


What have I setup incorrectly? I'm not too sure? Port is setup correctly on the site and my host IP is mail.mydomain.com. Exchange clearly shows its receiving the mail from Dynu.

Hello Pal,

Usually this happens when a public IP is in the blacklists which is the main reason I chose dynu. Please let me know sorted on this? Am having a similar problem
Thanks