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Couldn't you just CC posterous? And for the archive, forward the mails to posterous?

I may be perhaps missing a finer point on why conversion is better.

I actually tried that (I thought it was that simple too) but the formatting came out all strange.

I sent a note to Posterous support, and they said that Posterous was not meant for email newsletter archives and I should not use it for that reason.

Weird but for some reason it doesn't quite work and they seem to not be focusing on that.