On Tue 09/Oct/2012 23:01:53 +0200 William Hue wrote:
>
> Original messages with attachments (or, at least, 2+ MIME sections)
> created by M$ LookOut! will usually generate "Invalid 7bit data"
> errors, as will forwarding said messages (and the "Invalid 7bit
> data" DSNs!) using Thunderbird.  Creating a new, plain-text,
> message with the same attachments, in either mail client, often
> (but not always) gets around the problem.

Googling around, it seems this bug has been around for years,
arousing various explanations, see e.g.

http://www.thesysadminhimself.com/2011/03/invalid-7bit-data-in-reply-to-end-of.html
http://www.developpez.net/forums/d920859/systemes/windows/windows-serveur/exchange-server/probleme-relais-smtp/
http://www.iredmail.org/forum/topic435-iredmail-support-invalid-7bit-data.html
http://forums.comcast.com/t5/E-Mail-and-Xfinity-Connect-Help/E-mail-not-reaching-me-what-does-this-error-message-mean/td-p/733645

How come nobody says what software issues the "Invalid 7bit data"
message?  It must be some very closed source thing  :-/

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