784048 - Sent email returns 'Remote host said: 550 5.6.0 Invalid header found'

Status: RESOLVED INCOMPLETE

(Thunderbird :: General, defect)

Description

[Mac]

Attachment: email_error.txt

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1
Build ID: 20120713134347

Steps to reproduce:

Emails sent to certain ISPs generate error message from Yahoo. Only a few recipient addresses generate the error.


Actual results:

My ISP is Yahoo. I get return message from [e-mail], with the entire message and the first 4 lines are:
Sorry, we were unable to deliver your message to the following address.
[email address]
Remote host said: 550 5.6.0 Invalid header found (see RFC2822 section 3.6) [BODY]

--- Below this line is a copy of the message.
followed by the full header and the message

It appears that the recipient receives the message, at least part of the time, in spite of the error message.  This started happening with [e-mail] and [e-mail] addresses, but now I getting it with addresses to [e-mail] and even one [e-mail] address.


Expected results:

I should not have received the message from [e-mail]. Attached is a typical error message.

Comment 1

[Ludovic Hirlimann [:Usul]]

Those emails are missing a blank line between the header part and body part  hence yahoo rejecting them.

Are you using extensions ?

Comment 2

[Wayne Mery (:wsmwk)]

(In reply to Ludovic Hirlimann [:Usul] from comment #1)
> Those emails are missing a blank line between the header part and body part 
> hence yahoo rejecting them.
> 
> Are you using extensions ?

Comment 3

[Phoenix]

Resolved per whiteboard