<!-- Please fill in this template according to your issue. --> | Q | A | ------------------- | ----- | Bug report? | yes/no | Feature request? | yes/no | RFC? | yes/no | How used? | Standalone/Symfony/3party | Swiftmailer version | x.y.z | PHP version | x.y.z ### Observed behaviour <!-- What does the code do? --> ### Expected behaviour <!-- What should the code do? --> ### Example <!-- Example to reproduce the issue. -->