Changing SMTP server

I purchased the book "The iSeries & AS/400 Programmer's Guide to Cool Things" 
and found something that allowed me to have our SMTP server on our iSeries 
point to our Outlook accounts, which were on a different email server. The end 
result was we could use SNDDST and it looked like the emails were coming from 
our Outlook accounts. I created a TCP/IP Host Table with the proper IP address, 
and server name of our mail server. I changed the SMTP server on the 400 to 
point to the Host Table I created. I changed directory entries of our users to 
use our email accounts at our outlook domain name, which is 
automaticproducts.com. Everything worked wonderfully until we upgraded our 
email server and the IP address changed, and so did the server name. I created 
a new TCP/IP host table with the new information, but now it doesn't work.  
Whenever I use SNDDST it appears to send fine, but the recipients are not 
receiving the emails.  Does anyone know if I am doing something wrong? Better 
yet has anyone ever had to redirect the SMTP server on their iSeries to a new 
email server? Any help would be appreciated.
Griz

Grizzly Malchow - Programmer/Analyst 
Gross-Given Mfg. Co./Automatic Products International