Thanks for the references. Yes, it is indeed puzzling. Here is a snippet of
the DSNs I get:
UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<a...@domain.tld>:
smtp.svc.telus.net [199.185.220.249]:
>>> >>> DATA
<<< 552 5.2.0 Invalid 7bit DATA
Telus now runs "InterMail vM.8.01.03.00 201-2260-125-20100507".
Before I started getting those Invalid 7bit DATA messages, they were running
"InterMail vM.7.08.02.00 201-2186-121-20061213" and "InterMail vM.7.09.01.00
201-2219-108-20080618". Some something happened between vM.7.x and vM.8.x .
Here is what they had to say about it:
On 2010-12-16 12:47, Abuse Teluscom wrote:
> Hello,
>
> We have been experiencing some issues with our mail server today due to a
> series of upgrades on it. We ask for your patience at this time as we work
> to solve these issues.
>
>
> Brad, Internet Abuse Team Member
> Consumer Customer Operations
> TELUS Communications
> Email: ab...@telus.com
>
> http://www.mytelus.com/internet/policies/TISAA.do - TELUS Internet Services
> Account Agreement
> http://www.mytelus.com/internet/policies/display.do - Acceptable Use Policy
>
> *Please include the original email in any replies
On 2012-10-10 21:18, Alessandro Vesely wrote:
> 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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