Does your hijack product help take care of the problem with spammers using my or my clients' from address and all the undeliverable mail coming back to my mail server?
No. That's a different issue. What we have with spam is the following:
[1] Spam being sent to your users. This is 98% of what people complain about. Declude JunkMail handles this.
[2] Spam being sent *from* your users (or from spammers that are allowed to send mail through your mailserver for some reason). That's about another 1% of spam complaints. That's what Declude Hijack takes care of. If your server is properly locked down ("No mail relay" or "Relay for addresses"), and your users will not send spam, you don't need this, though.
[3] Joe-jobs. That's the final 1% of complaints. That's what you're referring to above, and nothing can stop it (although SPF can help, by blocking the spam on servers using SPF; see http://spf.pobox.com for details). The undeliverable E-mails can be handled by filters using your favorite anti-spam tool.
-Scott
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