MailerQ DKIM max. body length?

DKIM fails with this:
$campaign_html =
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n" .
"Test line here with no more than 80 characters and linebreak<br>\r\n"
;
DKIM works when 1 line is removed or commented out.
Tested at brandonchecketts.com, error is
result = fail
Details: body has been altered