On Wed, Jan 19, 2005 at 08:44:45PM +0530, Devdas Bhagat wrote: [block]
Inbound port 25 for dynamic IP addresses.
Why?
[I wrote]
Graylist your inbound SMTP connections.
Ewwwwwwwwwwwww. Does not really scale for higher volumes of mail, but is reasonably useful on a low volume server.
Why? I'd think once you got legit mail from a domain you'd whitelist it. And you'd start by whitelisting known legit domains, if you have a list of known legit domains.