Thanks Chris and Sam for the prompt replies.

Shantanu
-- 

* Sam Clippinger <[email protected]> [090110 09:08]:
> I would recommend using the "graylist-exception-rdns-file" option 
> instead of whitelisting those servers, because whitelisting will allow 
> them to bypass all filters, including sender/recipient blacklists.  You 
> are correct about the domain wildcard however -- you'll have to list all 
> of Yahoo's TLDs individually.
> 
> -- Sam Clippinger
> 
> Chris wrote:
> > Hi Shantanu,
> >
> > I would suggest using RDNS whitelist. You can add wildcards, so adding 
> > .gmail.com for example should do the job.
> > Yahoo on the other hand could be a bit complicated, because I don't know if 
> > adding .yahoo. as a domain works and you would have to add .yahoo.<tld> for 
> > each possible top level domain...
> >
> > Regards,
> > Chris
> >
> >
> > -----Original Message-----
> > From: [email protected] 
> > [mailto:[email protected]] On Behalf Of Kulkarni Shantanu
> > Sent: Friday, January 09, 2009 7:17 PM
> > To: [email protected]
> > Subject: [spamdyke-users] not greylisting popular domains
> >
> > Hi,
> > I am happily using greylisting feature of spamdyke. But I have a small
> > issue. Many big domains like gmail, yahoo, hotmail, rediffmail do not
> > retry delivery soon after been greylisted. This results in mails from
> > those domains delayed a lot. Also, the domains have many outgoing IPs,
> > so cannot whitelist each IP easily. 
> > Can anyone offer suggestions for this situation?
> >
> > Thanks,
> > Shantanu
> >   
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