I noticed something strange today playing with forwarding options under mail options. I can't set a forward to an email address with the same username as that of the zimbra user. For example for bob@domain I set a forward to bob1@otherdomain but trying bob@otherdomain results in a error of "bob@otherdomain is not a valid email address". Is there some reason or option I've missed controling this behaviour? I'm running 4.5.9 NE.