Issue i can not connect my smtp with port 25

[mohmede]

when i try to setup outlook with port 25 ( cannot connect to smtp) it only connect with port 587
the provider told me there is no port limitation
when i tried to connect many times the server connected for 2 minutes then the port goes down again , only have plesk firewall , fail2ban

i cant paste main.cf here too long

 

[Ales]

Which provider told you that there are no port 25 limitations? The limitation can be on either side, the network you're connecting from and also on the network your server is on. Both is quite common these days...

The odd thing is that the connection succeeded for a short while. Did you check the IPs blocked with fail2ban? Although, in this case I wouldn't expect the connection to 587 to work either, but it depends on how your fail2ban is set up.

 

[mohmede]

Which provider told you that there are no port 25 limitations? The limitation can be on either side, the network you're connecting from and also on the network your server is on. Both is quite common these days...

The odd thing is that the connection succeeded for a short while. Did you check the IPs blocked with fail2ban?

I put the server ip and localhost on white list
and my ip on white list too
still have the problem

 

[mohmede]

here is the log for the test mail

Nov 7 20:09:40 server dovecot: service=imap, [email protected] ip=[127.0.0.1]. Connection closed (IDLE running for 0.001 + waiting input for 0.001 secs, 2 B in + 10 B out, state=wait-input) rcvd=11, sent=432