On Sat, Aug 30, 2003 at 04:01:19PM +1000, Russell Coker wrote: > Backup MX servers serve no useful purpose in the modern Internet, this is why > big sites such as microsoft.com and hotmail.com don't have them.
agreed. > If you have a backup MX then it should know all the acceptable email > addresses in your domain and enforce all rules regarding acceptable content. > Then it can block content through SMTP 550 and 450 codes. yes. if you don't have 100% administrative control over your backup MX server(s) then you should NOT be using them. craig