Breaking: #88643 - Removed swiftmailer/swiftmailer dependency¶
TYPO3's dependency swiftmailer has been removed in favor of new symfony-based components "mime" and "mailer".
This means that all SwiftMailer-related PHP code has been removed.
Custom SwiftMailer plugins or transports cannot be used without further
migration anymore and will result in a fatal
Using SwiftMailer-specific API by using TYPO3's
TYPO3\CMS\Core\Mail\MailMessage class might result
E_ERROR when sending out emails.
Any TYPO3 installation with third-party extension sending out emails or extending TYPO3's email sending capabilities.
Search the third-party extensions' code for occurrences of MailMessage or
parts starting with
\Swift_ and migrate to symfony/mime or symfony/mailer
APIs, which are included in TYPO3 v10.0.
If required, SwiftMailer code can be installed via composer (when running TYPO3 via composer)
composer require swiftmailer/swiftmailer.