Does your main service have a web interface?
What you also might try is telnet in to your mail server via the secure and unsecured ports
I just tested ssh and telnet and the connection request timed out, not surprising although
the IP Lookup returned results which looks like you have a static IP in the office
can you connect to the mail server with your mail client(Thunderbird, OutLook or ---)? if yes check the account settings
is your firewall blocking the connection?
is the mail server on the same server as EspoCRM?
confirm user name is correct, my mail server requires email address as user name but login is just the name without the URL
I can't think of anything else at present

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