I'm curious what everyones thoughts are on handing off .OFT files (Microsoft Outlook Email) as a template to be used for sales efforts. We use an ESP to send out mass marketing emails, but sometimes there's a request to hand off .OFT files so sales can put a personal touch to their close contacts.

Does anyone else run into this?
Have you run into issues with this kind of method?
Would this be considered best practice for marketing emails?