1d85d6b43c
Fixes: #9633 Issue link: https://github.com/spring-projects/spring-integration/issues/9633 The message flags of the received messages are outdated and don't contain the changes of `AbstractMailReceiver#setMessageFlags`, because the flags are only applied to the original message and not the copy (`AbstractMailReceiver.IntegrationMimeMessage`). * Call `setMessageFlagsAndMaybeDeleteMessages()` for `IntegrationMimeMessage` copies as well **Auto-cherry-pick to `6.3.x` & `6.2.x`**