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

Dmitry Bystrov

10 months ago

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:

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

Port misconfiguration for the external SMTP server configured in Plesk.

Log in to Plesk GUI
Go to Tools & Settings > External SMTP Server and configure a valid port according to the external SMTP server requirements

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