Unfortunately, because of the difficulty, many marketers either avoid email venues or try improper workarounds. Clicks First of all, don't be so zealous about tracking that you offend the reader. Some marketers try to use tracking URLs for discussion group posts just like they do for bulk email or banner ads. This is not the way to make friends or encourage clicks. If a URL redirects a user, it's quite likely that user will be offended, too.
Nobody likes being played.
Expectations from bulk mail and spam are different than for private email discussion areas. And no matter how clever you try to be, any moderator worth his salt can spot a Web URL advertisement masquerading as a discussion post. Making enemies of discussion moderators is not smart marketing. Second, don't forget the single most basic aspect of email links. Leave it off, and it won't be.