Question : Delay notifications in small business server

I have a Small Business server running Exchange in our office. I can send out emails to most companies, but a small amount of companies I get delayed notifications and they never reach their destination. My reverse DNS does not match my FQDN, it's resolving to my ISP. I know I can request this change with my ISP, but I am using the gateway IP instead of an allocated IP in the range they gave me. Is there a way to get around having the ISP change the DNS and me changing the IP we are using? Such as a smart host?

Answer : Delay notifications in small business server

How to set the smarthost:

http://technet.microsoft.com/en-us/library/aa996082(EXCHG.65).aspx

Get the smarthost details from your ISP.

Shaun