Feature: #94544 - Add new SMTP configuration settings

See Issue #94544

Description

A few more SMTP options are now supported by TYPO3 and can be set in the Install Tool:

  • transport_smtp_restart_threshold

Sets the maximum number of messages to send before re-starting the transport.

  • transport_smtp_restart_threshold_sleep

The number of seconds to sleep between stopping and re-starting the transport

  • transport_smtp_ping_threshold

Sets the minimum number of seconds required between two messages, before the server is pinged. If the transport wants to send a message and the time since the last message exceeds the specified threshold, the transport will ping the server first (NOOP command) to check if the connection is still alive. Otherwise the message will be sent without pinging the server first.

Do not set the threshold too low, as the SMTP server may drop the connection if there are too many non-mail commands (like pinging the server with NOOP).

It is now also possible to define an array with SMTP stream options in the AdditionalConfiguration.php.

Configuration Example:

Impact

Now it is possible to set more options for some smtp cases.