[Typo3] Direct Mail Subscription - Mail links garbage issue

[Jesper Weissglas]

Using the direct mail subscription (1.0.3) with 3.7.0 (tt_address 1.0.3, 
feuser_admin 1.0.2).

I have translated the HTML template file 
(fe_admin_dmailsubscription.tmpl) to Swedish. This template contains 
some parts that go on webb pages, and some parts that get sent in 
emails. The mails apparently get sent using UTF-8, so I created the file 
with Swedish characters in UTF-8 coding. If I use UTF-8 for the webb 
page parts it screws up in the browser, so I use HTML Entities for the 
swedish characters in the webb parts. This way both the webb and the 
email parts look OK for the user.

However the administration links in the mails look very funny, and 
cannot be clicked on. The ###THIS_URL### and ###FORM_URL### parts are 
OK, but the fields after that look weird, strange characters and spaces 
in the middle of the link.

Somewhere in the mail transmission chain a SMTP server has done a QP to 
8-bit conversion, which migt be causing this. This leads me to the 
conclusion that the mail does not have correct format headers when 
delivered from Typo3 to the local sendmail daemon (Content-Type, 
Content-Transfer-Encoding not correct).

I can't seem to find the place in the source where the PHP mail() call 
is done.

Anyone care to give me a clue as to where to look, what the format is 
supposed to be, or any other clues???

Cheers,
/jesper