Courier mail service do not respond

[Falko_Braune]

I'm using plesk with CentOS 6.6
After setting up some e-mail accounts over the plesk gui I tried to connect via a mail software (like thunderbird).
This failed with every combination of settings I tried.
So I checked if the POP3/IMAP services are running correctly using telnet.

I connected using the following command:

telnet <host-ip> 110

The response was:

Trying <host-IP>...
Connected to <host-IP>.
Escape character is '^]'.
-ERR Cannot connect to POP server <host-IP> (<host-IP>:110), NB connect error 1460
Connection closed by foreign host.

Did I miss to enable a setting?
The Plesk gui schows me, that the corresponding services are running:


Is there a solution?

 

[IgorG]

Are you sure that this port is not firewalled?
Check that this port is up and running directly on Plesk server with

# lsof -i tcp:110

 

[Falko_Braune]

You are right.
Despite the fact that the Plesk gui showed me that all ports are open.

Thanks!