I've been trying to get DomainKeys to work on my mail server. I know
this is not the DKIM newsgroup, but there's one issue I'd like to know
about before I dismiss it as the cause of the problem.

My mail server breaks up long headers with "\r\t" characters. Here's an
example of what I mean:

DomainKey-Signature: a=rsa-sha1; s=mail; d=nevis.columbia.edu; c=simple;
q=dns;
b=jXOJ3HiGQX+GP/t0eaAkXa0tHj4jZbs1jlI1xK9F4dhzHhHfNqa9PF7MvWf+kP0j K
xALUc16S1FBwbSehokU4w==

As you can see, the "b=" field (containing the DomainKey signature
information) has been broken into two lines.

When I've gotten my mailer to authenticate other folks' DKIM-signed
messages, their headers have had the keys on a single line; none of
their headers were "broken up" into separate lines.

I've googled around, and searched the Bat book, but I can't find any
parameter that controls whether a header is broken up, or how. I'm not
even sure whether it's sendmail, procmail, or something else that's
reformatting the header.

Does anyone have any insight into what portion of the mail process is
inserting the "/r/t" into the header, and how I might it turn it off, at
least for testing purposes?

Thanks.
-- Bill