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Reply All: doesn't work when To: or Cc: line is folded by Outlook/Exchange #4964
Reported by dpc22 on 1 Feb 2016 11:58 UTC as Trac ticket #1490653
2.2.3.Long Header Fields
Sadly it looks like Outlook/Exchange ignores this SHOULD requirement, and can generate a To: header which looks like:
with a CRLF+TAB sequence before the first "<".
All very well until I try to reply to such a message using Roundcube 1.0.8.
While it looks okay in the editor, Exim complains:
when I click "send".
My suspicion would be that the CRLF has leaked somehow into the SMTP line recipient list, but I'm not quite sure where to look.
I will attach a raw RFC 5322 message as a test case. We are using Cyrus 2.4(.17) as the mailstore: I don't know if that is significant.