Blocking ports 995, 587, 465?

Question

System administration

Good time!
Hope somebody can help.
I can't set up SMTP and POP sending on my computer.
As I understand it, the problem is in ports 995, 587, 465. I checked telnet pop.gmail.com 995 in the command line and did not receive a response.
Using the port forward program, I checked the ports, they were closed.
Firewall disabled, no antivirus. I also set up port forwarding on the router, but still - without result

Answer 1

You don't need to do any port forwarding on the router.
You initiate the connection from within and work through NAT.
There will be no answer - the main thing is that the connection hangs, and does not break right away.
Port 995 is waiting for SSL, which your telnet client cannot provide.
Want to check - use openssl to connect.
openssl s_client -crlf -ign_eof -connect pop.gmail.com:995

Answer 2

Ports 465 and 995 are smtps and pop3s respectively. According to them, the service waits for an SSL connection already established by someone, which telnet cannot give. You can check such ports only through openssl s_client.
587 - submission port, the port of a regular local mail delivery service, many people use it to send messages from the local system (instead of port 25)
You don't need to forward any ports to send from inside - NAT will do everything by itself.