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Can not reach Kerio Connect SMTP from the internet [message #128093] Tue, 23 February 2016 00:08 Go to previous message
aceint is currently offline  aceint
Messages: 29
Registered: July 2011
Hello there,

I am facing a weird problem with my Kerio Connect 8.5.3. I would love to integrate the SMTP in some third-party software (such as a ticketing system e.g.) but I just can not connect to it from outside the office through our external IP address and port 25/465/587. IMAP works just fine, though. So does the web mailer. Even sending mails through the web mailer succeeds.
It is just the SMTP that I can not connect to.

I first thought it is a misconfiguration in our firewall but I can telnet any other forwarded port through our external IP, just 25, 465 and 587 will not work. DNAT rules do exist, though. And they are a 100% correct.

Also the services are up and running on the Kerio Connect and use the standard ports (25, 465, 587).

Can someone just help me out with this issue? I'd be very grateful.

Thank you very much in advance!

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