I have an installation of Postfix & Dovecot on a Centos 7 server. While being logged into the server via ssh I am able to use telnet and openssl to connect to localhost like
openssl s_client -starttls smtp -crlf -connect localhost:25
authenticate myself, and send an email. However, when I try to connect to the server from my local Computer, replacing localhost with the server name, I get the error message
connect: Connection refused
connect:errno=61
Using telnet I get the error
Trying XXX.XXX.XXX.XXX...
telnet: connect to address XXX.XXX.XXX.XXX: Connection refused
telnet: Unable to connect to remote host
The file /etc/postfix/master.cfcontains the lines
smtp inet n - n - - smtpd
submission inet n - - - - smtpd
The command netstat -tpnl | grep :25 results in
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 10327/master
tcp6 0 0 :::25 :::* LISTEN 10327/master
Calling systemctl status iptables.service on the server yields
● iptables.service
Loaded: not-found (Reason: No such file or directory)
Active: inactive (dead)
Entering my mail server at mrtoolbox.com results in the message
Connecting to XXX.XXX.XXX.XXX
1/20/2016 3:43:42 PM Connection attempt #1 - Unable to connect after 15 seconds. [15.01 sec]
PWS3v2 15193ms
Can you give me some hints what I might have missed or how to check what is going wrong, here?
