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Logos that seem to give the wrong message to me
1.0.8 - gives the image of a recycle bin in the main logo. That is not consistent with the idea of a spam filter IMO, and shows the unhealthy influence of a Windows user <g>. Recycle bins are not for trashing things!
1.0.9 - The flames on the envelope may give the opposite viewpoint of 1.0.8 - instead of being too permissive, here's a fearful vision of the future where your mail will catch on fire or be destroyed. Again, this lacks the feeling of discrimination.
1.0.15 - the lock on the envelope. Well this is closer than 1.08/1.09 in my opinion but still doesn't give the right feel - it would be great for SECURING or ENCRYPTING, but maybe not right for spam.
Might I suggest (and I do so humbly for my artistic skill is nil) to the artists that if one wants to illustrate the action upon the mail itself that the motif of filtering or selectivity is paramount.
Some interesting background
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