error on signing forwareded, answered e-mail or e-mail with signature

[Großberger]

When I sign an e-mail that is a reply, forwared or contains a signature (automatically appended text configured in Thunderbird), OpenPGP says something like "Error trying to check the signature" (may vary because I translated it) and in the details it says "Wrong sgnature" when I send the e-mail.

First had this problem with attachments, too but removing the option that enables "--" as begin flag for signatures seemed to fix that.

EDIT: Using PGP/MIME fixed it. Is there a way to correctly sign those e-mails without using PGP/MIME?

[Ludwig Hügelschäfer]

Hi,

do you compose plaintext or HTML-messages? If plaintext: is your rewrap limit correctly set to 72 characters? Does the signature contain very long words or long series of characters without spaces?

[Großberger]

Glad you replied.
I composed in HTML and did not notice, outch.
My signature does not contain long words but a long line of words (space seperated). If I leave this out, it works.

Changing to plaintext lets me reply and forward E-Mails without problems.

Do you know a way to wrap HTML E-Mails to have only 72 characters per line?
Thank you anyway because the main problem is "solved".

EDIT: Should I better use HTML or plain for optimal compatibility with my contacts' clients/webmailers?

[Ludwig Hügelschäfer]

HTML only works reliably when used with PGP/MIME. There's no other way, sorry. This produces a text/html part and a signature mostly shown as attachment on non OpenPGP aware clients. You'll have to experiment :-)

[Großberger]

Thanks again, I'll figure it out.