Secondary SMTP address issue



I have my
> domain name x.com . now my company register a new domain name
> y.com We are able to forward the new domain to the old domain website.
> We would like to be able to receive email through the new domain name
>MX record of x.com = mail.x.com( which is external IP address of the
>router, we use permanent IP)

MX record of y.com = mail.y.com which point to mail.x.com

Therefore, all email will go to the same IP address
What I did was in the recipient policy, create a secondary SMTP address for
y.com
and apply to every user. I left the old domain as the primary email so the
user can still
> receive email from the old domain since they are the same account
> when we send email internally using the new domain we receive it
> The new domain is for the same exchange server that the old domain is
> using. But when use user@xxxxx to send email to my external email account,
> I received sending address as user@xxxxxx When I use external email
> account to send to user@xxxxx, it returns a 'could not delivery, unknown
> mailbox etc..' error message.
> How do I configure Exchange server and enable user to be able to send
> and receive from both old and new account


.



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