For some reason, I need to add a new domain(touch.com)to zimbra

1、Redefine touch.com MX record pointing to zimbra

2、Goto admin console add a new domain name(touch.com)

3、Create new account (test@touch.com)

4、And then ,I tried send mail to test@touch.com from gmail ,but got a wrong return

< test@touch.com > : host mail.touch.com [*. *. *. *] said: 550 5.1.1
< test@touch.com > : Recipient address rejected: touch.com (in reply to RCPT to command)

5、And test@touch.com cannot login through web client, display username and password error

What did I miss important Settings? Tks