Changelog (v5.3.10...v5.4.0-BETA1)
- feature #42471 Add generic types to traversable implementations (derrabus)
- feature #43751 Add a "preview" tab in mailer profiler for HTML email (lyrixx)
- feature #43018 Adding support for TagHeader and MetadataHeader to the Sendgrid API transport (gnito-org)
- feature #42982 Add Session Token to Amazon Mailer (Jubeki)
- feature #42941 Implement Message Stream for Postmark Mailer (driesvints)
- feature #42710 Added OhMySMTP Bridge (paul-oms)
- feature #42662 Consume a PSR-14 event dispatcher (derrabus)
- feature #42219 Add support of ping_threshold to SesTransportFactory (Tyraelqp)