So we decided to have a company wide email signature which pulls user info from AD to fill in the HTML template. What I have found out is that iOS devices send email as plain text which displays the HTML content with strings of text in emails send from
those devices. The only way I have found to make this work is have the user keep the default "Send from my iPhone" signature and exclude the rule based on that text in the body. Is there a cleaner option in case our users decide to change their default
signature on their iOS devices?
You might use the Set-TransportRule cmdlet and one of the exception clauses to look for something in the header. I looked at an ActiveSync-generated header from my Droid (I don't have an iPhone to try this out on) and I see this:
We were not winning at this either, until today, we implemented Exclaimer Signature Manager for Exchange which can force HTML from mobile devices. Its a super good product and as a result we are going to make our selves authorised re-sellers.
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