Version 3.0.0 of Symfony Mailer extension for Yii2 was released. This version fixes and enhances code significantly.

• Added an exception if there is no transport configuration.
• Extensive rewrite to make it more statically typed and better testable.
• PSR-3 compliance.
• Logger doesn't use ervice locator pattern.
• Implemented interfaces and wrappers for signers and encrypters.
• Exceptions aren't silenced anymore.

Note that this release is not fully backwards compatible. Check your project is fine before going production.