How to receive same Email on mail.mydomain.com & mail1.mydomain.com

Hi ,
mail.mydomain.com running zimbra 7 OS,
mail2.mydomain.com running zimbra 8 NE,

I want to switch my mailing accounts to NE after few days , but still we want to give user access to both servers to reach their new emails.
i want if someone sent email to user1@mydomain.com mail & mail1 servers receive the email , so user1@mydomain will login from any of our server can have his/her latest emails.
user1@mydomain.com -> mail.mydomain.com
user1@mydomain.com -> mail2.mydomain.com

My Mx records are .
mail.mydomian.com -> MX:10 :
mail2.maydomain.com ->MX:20 :

As in above MX records only new emails are recived by mail.mydomain.com .As its Higher priority "10" . What priority i need to change that email go to both servers.

Thanks and waiting

Is it possible to receive emails at a time on Two servers with MX priority ???

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Originally Posted by farrukhndm

Is it possible to receive emails at a time on Two servers with MX priority ???

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I doubt MX priority can be used for this. The mail is delivered to the first MX host that responds.

MX only determines the order in which MTA connections are attempted. Only one system will receive any given email.

One MTA I've used in the past had a user setting to forward all email and keep a copy. This would fairly reliably keep the same received email on both MTAs.

One problem this aproach would have would be with sent email. If a user used different MTAs to send email, the Sent folder would not contain the same set of emails sent by the user.