Bypassing a VIP based on destination address

OK, you're looking for either the CONNECT (If using HTTPS on webmail) or the GET/POST/whatever requests if using cleartext. YOu do something like (Completely untested, syntax may not be 100%... YMMV... ).

if { ([HTTP::uri] contains "webamil.server.com") || ([HTTP::header host] equals "webmail.server.com") } {
  use pool webmail_pool
  return
} 

use pool proxy_pool
snat automap

The basic logic is that we test for the webmail server being in the URI or the host header of the request (Some hosts don't use FQ URI's when talking to proxies apparently, so we test the URI and the host: header). If we have a match, then we use the webmail pool and just return.

Otherwise we fall through to the default actions... Which is to use the proxy pool, and perform snat automap (Or whatever snat you want).

The VS should NOT have SNAT enabled... The iRule will doit for you.

H