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...ler patches that accomplish the same thing in v2.2 using built-in functions and pushing the re-encoding slightly further up the call stack - address/username being interchangeable over most of the lmtp code makes significant changes problematic, so I thought it best not to try a rework. Looking at gitub, though, I don't see any significant changes in behaviour as far as the problem I'm seeing goes, which is worrying. What I'll do is leave the patches here for reference, and pick this up again after the v2.3 release. If you do have time for a further response, I could also provide them...

Hi again, I've not heard anything further regarding this bug, so I've had a look at the code. To restate the bug in a more precise way: LMTP in dovecot treats external RFC822 email addresses in the envelope recipient and internal usernames as almost identical/interchangeable. This is incorrect and leads to issues when attempting to use director as an LMTP proxy to proxy to recipients