I've been at this for quite some time now, not really getting it to work. Unfortunately I am only able to test on our Office365 account and changes take forever to propagate so I can test after changing rules..
The problem is as follows
My organisation wants a centralised signature added to all emails (this is easily fixed by adding a transport rule and "append a disclaimer ...")
Here is the kicker however, when the mail is sent as text/plain the nicely formatted HTML signature is wrapped (thats what we decided to do, so a signature is added at least) but it look horrible.
Is there any way of finding out if the mail is text/plain and then adding one signature and another if the mail is sent as HTML?
I've been playing around with rules and checking in the headers for
Content-Type and trying to match against that but so far, no luck.
I believe Office365 runs Exchange 2010.
edit Found the following on the Microsoft boards after some more digging:
.. this would only work if you set your email to use POP or IMAP. Otherwise the content-type will not be viewable by the transport rule, and would therefore not work.
That explains why my attempts to look for
Content-Type header failed..