[Serializer][Mime] Fix Mime message serialization #37847
Merged
+429
−6
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Symfony serialization is used by Messenger to serialize Emails. By Email messages are data objects with some logic to prepare emails to be sent. Without configuration, the Symfony Serializer serializes Emails with too many data (and triggers some unneeded validation).
This PR aims to fix the above issue and at the same time makes serialized emails as small as possible and as readable as possible.