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03/25/2022 16:32
I have blocked all ports except:
- 143, 110, 993, 995, 587
This is enough (587port) to send a message.
But If someone send me emails, I don't receive them. At the same time, others do not receive errors that the letter has not been delivered. If I unlock\allow port 25, then the emails arrive, even those that were previously stuck.
03/27/2022 13:09
Hi Ilya and welcome to zextras community!
All the comunication between servers must be over port 25 as the standard of SMTP protocol.
Ports 587 or 465 is only for clients ( send email from your client to your server ).
I suggest you to open all tcp traffic for port 25 (in/out) or you are not be able to receive or send email to an external server.