[TYPO3-english] Negative jumpurl in Direct mail

[Jochem Nabuurs]

Hi list,

We're using the direct mail extension to send newsletters.
This works great when emails are read in HTML format, but in text format 
all links to content are changed:

HTML:
http://www.domain.ext/index.php?id=2600&rid=f_4842&mid=1729&aC=93316d19&jumpurl=2
TEKST:
http://www.domain.ext/index.php?id=2600&rid=f_4842&mid=1729&aC=93316d19&jumpurl=-2

The problem is that jumpurls are changed to a negative value.
This only happens in text mode.

I'm not at all familiar with the direct mail extension so I hope someone 
can tell me the direction to look, or even supply me with a working 
solution(that would be great!)...

Thanks in advance!