I have been attempting to host my own email server for several days. I can receive mail, but unfortunately i cannot send mail from my server. Running telnet tells me that the outbound port 25 is blocked. I checked with my ISP and they advised that they do not block any ports inbound or outbound. At this point I believe it is my MicroTik router preventing me from using the outbound port.
What is the firewall filter that will allow me to do this?
RouterOS v6.39.1 is installed.
Thank you
Joe
Hello, jwityshyn!
Probably you may get more replies if you will move your post to different forums: Beginner Basics or General, here people discussing Dude monitoring tool.
On these forums you may find similar questions and maybe will find a solution.
If you say that you receive incoming mails, this may mean that you have configured DST NAT rule to your mail server on mikrotik (sure, you server may get mails in different ways).
In case when your SMTP server is located after the miktorik and uses it as a default gateway, you should check forward chain rules:
IP → Firewall → Firewall rules
By default there are no blocking rules defined. You also may create an Allow rule in forward chain, and place it as a first one, to explicitly permit 25 port through mikrotik. You may enable logging in it to see if traffic going through this rule: Manual:IP/Firewall/Filter.
Additionally you may use email tool to verify if you can send emails directly from the mikrotik, in such case output chain on firewall is used.
Thank you!