Here's a little hint for PRs who think putting small logos in their emails is a really neat idea. It's not. It's a good way to end up in the spam-trap.
Like a lot of people, I have two lines of spam defence. One is on the mailserver, courtesy of good old SpamAssassin. The second line is the email client which, in my case, is Entourage. Its spam filter is fairly effective and has worked that a lot of spam messages have little GIFs embedded in them in an attempt to work around the Bayesian text filters.
What this means is that all those companies that think they're clever for having worked out how to format their emails prettily and stick little images of "PR Company of the Year" trophies and their logos in them are finding that the emails just wind up floating around with over-the-counter stock spam. Sometimes, I fish the messages out of the bin and, if they are really lucky, the senders get whitelisted.