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PHP Mail() scripts do not work with external SMTP configured in Plesk

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Stefan Yakubov
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • PHP Mail() scripts do not work with configured external SMTP server. This can be verified in Tools & Settings > External SMTP Server

  • The following error appears in /var/log/maillog file:

    CONFIG_TEXT: Apr 20 20:19:27 host msmtp: host=smtp.gmail.com tls=on auth=on user=user@gmail.com from=root@host.name recipients=user2@gmail.com errormsg='the server sent an empty reply' exitcode=EX_PROTOCOL

Cause

Port misconfiguration for the external SMTP server configured in Plesk.

Resolution

  1. Log in to Plesk GUI

  2. Go to Tools & Settings > External SMTP Server and configure a valid port according to the external SMTP server requirements

Additional information

How to configure Postfix to send emails using SendGrid

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