email error : 110 Can’t open SMTP stream

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

Message not sent. Server replied:

Connection timed out
110 Can’t open SMTP stream.

This problem usually occurs when CSF is installed on your server and it is interacting with the working of squirrel mail. So while configuring CSF enable both SMTP_BLOCK & SMTP_ALLOWLOCAL.

#vi /etc/csf/csf.conf



restart csf and exim service