Knowledgebase: E-mail Forwarders
Can my e-mail forwarders forward to any e-mail address?
Posted by Roy Petersen on Feb-15-2007 12:16 PM
Below is acceptable forwarding addresses for any one of your e-mail forwarders:
  1. POP3 account (@yourdomain.com), hosted by Woollybear.com
  2. A POP3 account (@aol.com) not affiliated with Woollybear.com
  3. Another e-mail forwarder not affiliated with Woollybear.com

So in short, your forwarding address can be anything except for another e-mail forwarder on the same domain name.