Adds support for external providers to Direct Mail. This extension extends the types of recipient lists handled by Direct Mail with an entry for parameterized custom lists. These custom lists are prepared by user functions and may easily reuse your own business logic.
Compatibility with both direct_mail v5.2 (TYPO3 v8) and v6.0 (TYPO3 v9) to ease your migration. BEWARE OF THIS BREAKING CHANGE: your custom methods "getWizard()" should now accept an additional $row parameter of type array right after the reference to $PA (and before $checkOnly). In addition, you may need to rework a bit your custom JS as TYPO3.jQuery is not available anymore, even in TYPO3 v8, and should be replaced by the standard $.