Blocking content
If its such a big problem for those that are getting spam with links in the email pulling in content from other sites, then keyword block them. Its not that all sites have bad content, but if your constantly receiving image content from another site not related to the email and the link to the spammers website, then block it You'd be amazed by how much junk gets tossed into the bit bucket by that filter technique, at the very least, quarantine it to figure out a pattern and if your users, REALLY want it.
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Biting the hand that feeds IT
