Hi,
It was our bug, not Apple's. Apple reproduced the bug and added a
workaround this morning, currently going through the process:
https://github.com/apple/swift-nio-imap/pull/774
However, I do NOT understand how aox can have this bug.
https://github.com/aox/aox/blob/7fd7124e7b9049e3e16bdd143b2a439aaa37628d/imap/handlers/id.cpp#L70
shows quite plainly that aox does not send the extra space that Apple's
code rejects. The space is there, I have seen with my own eyes. Puzzling.
Must look on Saturday.
Arnt