On 7/7/2014 8:04 PM, Hartmut Figge wrote:
> David E. Ross:
>
>> The preference mailnews.headers.showUserAgent tells Thunderbird what to
>> do when SENDING messages, not receiving them.
>
> Oh? Did you test that? ;)
>
> ----- mailnews.js -----
> // hidden pref for controlling if the user agent string
> // is displayed in the message pane or not...
> pref("mailnews.headers.showUserAgent", false);
> ---------------
>
> Hartmut
>
I just now tested and got a very big OOOOPPPPPSSSS!!!!
The preferences controls whether the User-Agent header field is
displayed when the user has selected [View > Headers > Normal].
However, the rest of my reply (which you did not quote) is still valid.
That is, if you receive a message from someone who uses an application
that does not insert a header field for his or her user agent,
Thunderbird has no way to create and display it.
For newsgroup messages, the User-Agent header field is indicated in RFC
5536 as optional. For E-mail messages, the User-Agent header field is
not even mentioned. All header fields beginning with X- (e.g.,
X-Mailer) are non-conventional. I strongly doubt that Thunderbird
recognizes X-Mailer (or any other similar header field) as a substitute
for User-Agent.
--
David E. Ross
<http://www.rossde.com/>
On occasion, I filter and ignore all newsgroup messages
posted through GoogleGroups via Google's G2/1.0 user agent
because of spam, flames, and trolling from that source.
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