VS Redirection while maintaining Source IP

Another question and I'm not sure if this is possible, but can the LTM intercept/process the request from the school before it hits the PROXY_VIP and look at the header to see if it matches http://www.webmail.com and redirect it to the WEBMAIL_VIP - or does the connection first have to hit the PROXY_VIP where the irule HTTP redirection will be actioned???

 

 

Thanks.

 

 

Andy