Greylisting with MailScanner, Sendmail, Spamassassin

[Kevin Spicer]

On Tue, 2005-11-15 at 17:10 +1100, Michael Mansour wrote:
> But MailScanner is the one that listens on port 25, I
> believe it then forwards the message to the virus
> scanner first? then SA? which uses DCC, razor and
> pyzor to determine whether the message is spam?

No.  sendmail listens on port 25, queues the message, MailScanner scans
all messages in the incoming queue before moving them to the outgoing
queue to be sent onwards by a second sendmail instance. You are also
confusing the DCC stuff.  DCC as used by SpamAssassin is the
'Distributed Checksum Clearinghouse' spam content filter - which
basically works by comparing checksums of mail against checksums of
known spam.  [All these explanations are very much over simplified]  DCC
does have the ability to use greylisting, however as you are not calling
DCC from sendmail this is not relevant to the use of DCC within
SpamAssasin.  
To implement greylisting in sendmail I would suggest you use Anthony
Howe's milter-gris http://www.snertsoft.com/sendmail/milter-gris/ 


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