SMTP Error 111 : Typically from Linux based email systems such as SquirrelMail and Mailman. The message will usually go like this : “Connection refused, 111 Can’t open SMTP stream”.
All SMTP Error 111 errors usually point to an inability of your server to communicate with the remote SMTP server(either the recipient’s SMTP server or your ISP’s SMTP server) or to a Linux/SMTP software configuration problem,
typically /etc/hosts not being world readable, or a newly installed or reconfigured firewall preventing connection to the remote SMTP server, or incorrect hostnames and/or domains (e.g. does your sending
hostname match your IP address in a reverse lookup?), or exim not running. Telnet and logs should help you home in on the problem.
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