Josip Rodin wrote: > On Wed, Nov 29, 2006 at 11:42:10AM -0500, Dean Brooks wrote: > >> Keep in mind that there *are* sites out there that: >> >> - Dont ever retry at all >> - Retry only once after one hour >> - Retry once only every 24 hours >> - Treat temporary errors as failures >> - etc. >> > > I recently encountered one ISP which retries in fifteen minute intervals, > but only three times, before it gives up. Wackos. > >
And therein lies the rub. I think the solution is to apply greylisting selectively rather that to everyone. Suppose that you only applied greylisting to hosts that: Have bad RDNS In home/dynamic IP ranges Fail and header test Has any slightly weird HELO Mail From:<> Listed in Blacklists like Spamcop that are not good enough to block on What that you will probably block almost as much spam without the delays. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
