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Sendmail: email redirection

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http://www.linuxquestions.org – I have a test application that sends out email. It's configured to send it through the sendmail installed on the local machine (distro: RedHat 4.8; sendmail version 8.13.1). The email addresses are external to the machine. I would like to stop most of those emails. I can't use the /etc/aliases file, because that methodology only works for operating system addresses/userid's on the local machine. I'd like to block certain addresses from getting emailed out, so that users don't get spam from a test server that's been "cloned" from a production server. On the other hand, I don't want to turn off email altogether. I'm pretty sure that if I installed SpamAssassin I'd probably be able to rewrite certain addresses. But SpamAssassin is bloatware for what I want to do. If native sendmail is not able to filter out from sending certain emails based on the "To: " header (in the envelope) is there an app that uses sendmail's milter API that will? I've been away from heavy use of sendmail for awhile, so it had been awhile that I'd been on comp.mail.sendmail, but I notice that traffic is a fraction of what it used to be. Have sendmail users migrated to another forum? Any recommendations? === Al (HowTos)