On Tue, 5 Jul 2005, Patrick Muldoon wrote:
Even better if you can implement something that auto blacklists people that connect to your "secondary" MX's when you know that your primaries are up and accepting e-mail.
You might be able to connect to them but who knows what transient network even might stop a remote site from connecting to your primaries long enough that they try the secondary MX. A related thing is that these days your mail system has to check the validity of the address on SMTP connect time. I've used/seen a few email setups where the front layer just checked the domain validity and the layers further back checked the full address. Doing that these days leaves you with a lot of email/spam to invalid addresses you have to drop or bounce. -- Simon J. Lyall. | Very Busy | Mail: simon@darkmere.gen.nz "To stay awake all night adds a day to your life" - Stilgar | eMT.