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blocking spam

Posted: Mon Dec 12, 2005 5:17 pm
by JasonTC
I read on the MailEnable (my mail server software) Web site that one thing I can do to reduce the amount of spam I'm receiving is to enable the option "Reject mail if sender address is from invalid domain". Does anyone know what might distinguish a valid domain from an invalid domain?

Any other spam-blocking ideas would be really helpful, too.

Thanks,
Jason

Re: blocking spam

Posted: Mon Dec 12, 2005 6:47 pm
by Chris Corbyn
JasonTC wrote:I read on the MailEnable (my mail server software) Web site that one thing I can do to reduce the amount of spam I'm receiving is to enable the option "Reject mail if sender address is from invalid domain". Does anyone know what might distinguish a valid domain from an invalid domain?
At a guess, if doesn't fit the relevant RFCs. i.e. It's not formatted correctly. My MTA (exim) does this by default.
JasonTC wrote: Any other spam-blocking ideas would be really helpful, too.

Thanks,
Jason
SpamAssassin.... I can't praise it enough. Since I started using SpamAssassin on my POP3/IMAP server I've cut SPAM down by about 95% -- I reckon I could get it down to nothing but I don't want to run the rsik of rejecting legit emails.