[vcf-midatlantic] MIME format

I am pretty sure that our list automatically strips MIME-formatted messages. Basically we have a choice. We can keep that setting and appease people who don't want formatted stuff, or we can eliminate it and appease people who don't want to use plain text. My opinion is that eliminating the option is probably the better choice, because it would be a compromise between having a traditional list vs. having a configuration which would likely not work for some (especially younger) members.