Mike wrote: > Simon Billis wrote: <snip>> >> I run a few sendmail servers that run MailScanner/Spamassassin/sendmail >> (current versions) on Centos 5.4 and Centos 4.8 These boxes accept mail >> for a large number of domains (6000+) scan the mail removing spam and >> then forward the ham to another server for delivery. I am attempting to >> stop any backscatter that these servers cause by only accepting mail for >> specific users at domain or for domains with a catch-all account. >> >> running >> make -C /etc/mail but this has no effect on the sendmail.cf file. My Does it not give output? Have you tried adding -d? <snip> > Another would be to use MimeDefang as the framework instead of > mailscanner. It has an option to check recipient addresses via smtp to > the delivery servers before accepting. You may have to write a snippet > of perl to get that right for multiple domains (that's a feature...). > This is less efficient but works in real time against the addresses that > will be accepted for delivery. I would question how "real time" that would be for every email for 6k+ domains. If a few have a large client base, or are expecting responses from a mass emailing, it might start to take a *while*, unless you've got pretty heavy duty equipment and networking. mark