[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: the Amazing Poly

ellanios82 writes:
> It's a pretty common requirement, as at one time it was the second
> best spam defence (after accepting mail only for named users). Not so
> good now that many ISPs are providing some kind of PTR record.

Some ISPs try to provide a single record for a group of their dynamic
IPs.  They bungle so that lookups fail for some IPs.  And then some
email providers apply that test to their own customers, *even after they
have authenticated*.  Hilarity ensues.

Then there is "probing" the domain in the "From:" line...
John Hasler 
Elmwood, WI USA

Reply to: