Hi everyone!

Recently I have, for at least the third time in my life,
made an effort to use PGP (open implementations).

With two correspondents, I have managed to send encrypted mails
back and forth, and to decrypt them as expected (at least we
could read the decrypted message).

For some reason, when I send an encrypted mail,
some of the components involved
(the sending Thunderbird, Enigmail, GPG or OS (Windows), or
the receiving Thunderbird, Enigmail, GPG, or OS (Windows again))
have inserted excess newlines. As a result, the content
contains an additional blank line after every intended line.

Note that even though I decided to ask here first,
I have no idea whether Enigmail is at fault here.
It could be any of the components involved.

The issue happens no matter whether I send or BCC to myself,
and read the copy sent to myself, or send to someone else
and ask them what they see.

This even happens on very short or empty lines, way shorter than
Thunderbird's wrap limit (79 chars or so).

Why?

In ordinary text, the excess blank lines are just annoying,
but when trying to send keys, for example, they really get in the way.

When I installed Enigmail, it asked a whether it should configure
Thunderbird so that problems with signing and encryption would be
minimized, and I chose "yes".

I have searched the net for "excess blank lines" and similar
expressions, but found no solutions.
Search turned up some indication that I am not alone with
such problems, but no solutions. For example, on page
http://forums.mozillazine.org/viewtopic.php?f=28&t=2384291
another user states that blank lines were inserted.

I have checked that "mailnews.send_plaintext_flowed" is false
for my Thunderbird, so that's not the problem.

I also found an article that laments a similarly appalling
mess: http://lwn.net/Articles/584542/
However, the article talks about wrapping due to long lines,
not about newline multiplication in general.

How can I find out which component messes up the messages?
Can I observe information flowing into and out of Enigmail?
How?

How can I fix this?

Regards, Rainer

PS: Yes, I could try to use a different mail client.
But hey, I have communication partners whom I want to support
who use Thunderbird - and why not? It is a renowned mail client.
If possible, I'd rather help fix the problem than avoid it.

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