MTA is a desaster since v20!!!

Hi All
we are running a RED 15w with v20.0 GA
No email is transmitted to any target as a "system" related email was generated to the queue like backup"
Our email server is behind the RED tunnel !!!

So finally, we organize a SD-RED-20 and upgrade from 20 to 20 MR1 (no change) to 20 MR2 (no change ) and - as of the pressure to v21 EAP1
If one contact get a system generated email no more emails are transferred !

So as of business emergency:
- How and where i can find the queued and stucked emails? (Hopefully not in a database)
  It´s relevant for business
- Our situation is more complicated as of ownership transition of the domains and business licenses
- The target is hosted in China (Behind the RED)
- My pain point is that all works fine before v20 and on the other hand some emails still pass through
- we are not able to define or declare what is causing the problem
- The firewall is reset up with a backup 2 days ago - and still the same issues - based on v20 GM - no MR !!!
- After that we try MR 1 and MR 2 and v21 EAP1
All sucks !

This Firewall is running as of transition of business on "Home" - but i think still there are a lot outside with the same problems and just quite as usual

Hope to find some ideas here
Priority 1: Is it possible to extract the emails some from the queue
Priority 2: Let development understand the pain as it exist since v20 GA !!

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