Author: Mark Date: To: Ron McKeating CC: Exim-Users \(E-mail\) Subject: Re: [exim] Is this true
On Wed, 2005-05-04 at 15:42 +0100, Ron McKeating wrote: > To verify the sender, MailHurdle looks at the originating IP address and
> the From and To addresses in the message. If a particular recipient
> hasn’t previously received a message from the sender’s IP address,
> MailHurdle sends a temporary failure message back to the originating
> mail server using a standard SMTP failure code. If the originating mail
> server is a bulk e-mail system, it will generally not resend the
> message. Viruses using raw SMTP to send messages will also not retry.
It's greylisting by another name. The archives will give the pros and
cons of greylisting (personally I like it, in it's place). There are
various problems and greylisting needs watching and whitelist entries
added. Also if the servers are a clustered group then the greylisting
data should be shared.
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