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These bounce messages should be hard bounces:
Same issue as this one, but with slightly different text:
https://xenforo.com/community/threads/550-permanent-failure-processed-as-soft-bounce.234103/
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- 550 No such local user, unauthenticated relaying denied
- 550 Invalid Recipient
Same issue as this one, but with slightly different text:
https://xenforo.com/community/threads/550-permanent-failure-processed-as-soft-bounce.234103/
Continue reading...