Can't Send Emails Out - But can receive emails - Please Help!

[petealois]

Hello All,

I have a Synology DiskStation and am running its Mail Station (Mail Server) and using a DDNS from No-IP.org.  Firewall and Ports are open.  I am able to receive email from outside my domain.  I can even receive emails from inside my domain.  I Can NOT send emails outside my domain like to (optonline.net, gmail.com, verizon.net, my work, etc.)  The message that displays in the returned email failure is below.  What did I miss from setup?

Final-Recipient: rfc822; [email protected]
Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; connect to mx2.optonline.net[167.206.4.79]:25:
Connection timed out

Thanks in advance for your help!

[oldschool]

Diagnostic-Code: X-Postfix; connect to mx2.optonline.net[167.206.4.79]:25:
Connection timed out

A debug log would helps a lot...


It seems the connection is lost while or after handshaking.
Could be the config or the wan mail server blocks you, like many other mail services.


Rgds.