Error handling of invalid date headers produces more errors about offlineimap3 HOT 1 CLOSED

From a bit more digging, it looks like part of the issue is that email.message.EmailMessage.__get__ will attempt to parse date headers as DateTime objects; it looks like it's done that since Python v3.3.0 / v2.7.5, per python/cpython@0b6f6c8.

That clearly fails when the format is as bogus as this. I think it's probably right that Python raises an exception in this circumstance (although I think "TypeError: cannot unpack non-iterable NoneType object" is not a particularly helpful error…) so I think offlineimap should cope with this without trying to parse the header a second time and thus generating the same exception in what's supposed to be the exception handling code.

from offlineimap3.