Email error : 110 Can't open SMTP stream

If you are getting following error while sending emails from squirrelmail.

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Message not sent. Server replied:

Connection timed out
110 Can't open SMTP stream.
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If above case if you are having shell access then login to your server with root user, then edit
config file and do the changes as given below.

Code should be edited into :

# vi /usr/local/cpanel/base/3rdparty/squirrelmail/config/config.php

$useSendmail = false;
to:
$useSendmail = true;

restart the cpanel and exim service.

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Refresh the squirrelmail mail and check ..

Done..