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XF 1.5 Unable to send email


New member

We moved from vB to xF 2 days back.

  • Digital Ocean Servers
  • Default email sending configuration of xF
  • Installed phpMail.
But still getting error:

Unable to send email.
Error: Zend_Mail_Transport_Exception: Email to xyz@gmail.com failed: Unable to send mail. - library/Zend/Mail/Transport/Sendmail.php:137

This could be issue with ports or our installations.

How do we debug to get to the problem?

Thanks in advance.