Important: #91070 - SMTP transport option 'transport_smtp_encrypt' changed to boolean¶
With https://forge.typo3.org/issues/90295 the allowed value for
$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport_smtp_encrypt'] has been
changed to a boolean value.
symfony/mailer does no longer allow to specify the
STARTTLS usage, as it will
be used by default (if the server provides the needed support).
Therefore, the SMTP encryption configuration setting
automatically updated by the install tool's silent configuration upgrade.
The configuration value
(string)tls is removed to reflect that symfony/mailer
STARTTLS. Other values like
No migration is needed at all, as no deprecation is thrown.