We've thought about this in the past and the trouble we always run into is processing the wide variation in email that can come in. People use thousands of different email clients, some use HTML, some don't. Some have vacation auto-responders. Some people get viruses that send spam to all addresses in their email address book.
I know it's possible to filter all of those things, we just haven't had the resources to tackle a project that size. I agree it would be a nice addition, but we're not quite ready to do it now.
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