Reply All: doesn't work when To: or Cc: line is folded by Outlook/Exchange

[rcubetrac]

Reported by dpc22 on 1 Feb 2016 11:58 UTC as Trac ticket #1490653

https://tools.ietf.org/html/rfc5322

2.2.3.Long Header Fields

says:

 Note: Though structured field bodies are defined in such a way
       that folding can take place between many of the lexical tokens
       (and even within some of the lexical tokens), folding SHOULD be
       limited to placing the CRLF at higher-level syntactic breaks.

Sadly it looks like Outlook/Exchange ignores this SHOULD requirement, and can generate a To: header which looks like:

To: "David Carter @ CAM"
        <[email protected]>, "David Carter @ CAM" <[email protected]>

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:

 unqualified recipient rejected: <"David Carter @=CAM">

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.

Migrated-From: http://trac.roundcube.net/ticket/1490653

[rcubetrac]

Comment by @alecpl on 1 Feb 2016 12:51 UTC

The problem is with @ character in recipient name. Confirmed in git-master.

[rcubetrac]

Milestone changed by @alecpl on 1 Feb 2016 12:51 UTC

later => 1.1.5

[rcubetrac]

Comment by @alecpl on 1 Feb 2016 13:27 UTC

And it indeed involved headers folding but not in a way you suspected. Fixed in 8dc756f.

[rcubetrac]

Status changed by @alecpl on 1 Feb 2016 13:27 UTC

new => closed