[MlMt] Issue with Mailmate and Basecamp

[Dries Geeroms]

> Can you verify that the message only contains a plain text body part 
> (if you use ⌥⌘U when viewing the message in Sent Messages)? If it 
> does then I cannot see why it should fail. MailMate generates more 
> standard-compliant plain text emails than many other email clients.

yep it does:

MIME-Version: 1.0
Content-Type: text/plain; format=flowed
Content-Transfer-Encoding: quoted-printable
X-Mailer: MailMate (1.7.2r4025)

[text]

> In other words, I'll probably need to see some proof that the problem 
> is MailMate before spending more time on looking into this issue :-)

Let me know if you want me to help you debug, it's not a big deal for me 
as I hardly use base camp and like I said it does work for other Project 
Management tools...