TYPO3 Core

The EnvironmentController of ext:install assigns the variable mailTestSenderAddress to the Fluid view. The variable is however not used, since it was migrated with a wrong name to ext:install in TYPO3 9.0.0. Previously in TYPO3 versions < v9, the variable was called senderEmailAddress and the MailTest.html template showed the sender email address to the user. Since the expected variable was empty, the text You should then receive a test email from "{senderEmailAddress}". had no meaning and was removed with #88523

The mail test should however show the sending email address, so that users will know the current configured sending address. It should also be noticed, that not receiving the test email also might be a result of a spamfilter or domain configuration (e.g. SPF record).

Additionally, the notice $GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport']['defaultMailFromAddress'] must be a valid email address. is superfluous, since this is already checked in EnvironmentController.

Finally, the fluid variable queueIdentifier is never used at some place and can be removed.