DO Support can't solve my problems. It's been over 14 days.

I gave all details, answered all questions and despite that the problem is not solved and they closed the ticket saying that I should check my firewall… which I left open during the tests.

I don’t know what else to do… Ticket #588076.

Maybe search for another sawslution?


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Try on your DO server

sudo ufw allow 26 sudo service ufw restart

Sorry for that.

Simply put, from my droplet I can’t connect to port 26 of my mail server (not on DO). Yes, the SMTP server runs on a non-default port.

If I telnet that server on port 26 from the droplet I get no answer. I flushed all the rules and set the default policy of iptables to accept.

The same tests run on another provider works perfectly. So I don’t think it’s the SMTP server fault.

Here are the tests…

From the droplet:

iptables -L -n

Chain INPUT (policy ACCEPT) target prot opt source destination

Chain FORWARD (policy ACCEPT) target prot opt source destination

Chain OUTPUT (policy ACCEPT) target prot opt source destination

telnet 26

Trying… telnet: Unable to connect to remote host: Connection timed out

From another provider:

telnet 26 Trying… Connected to Escape character is ‘^]’. ESMTP Exim 4.89 #1 Mon, 25 Sep 2017 14:26:09 -0400 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. quit 221 closing connection Connection closed by foreign host.

Maybe you could actually tell us the problem? This isn’t a place for complaining about support as this is the community forums.