MX records and A records issues

[Max Ma]

Hi all,
I had a server setup working perfectly for now. However, I like to change the
A record to point the abc.com to the web server instead mail server which currently pointed to.
however, once this A record change, the mail server will starting delivery the mail to the web server instead of the mail server.
The mx record remain
abc.com. MX 10 mail.abc.com.
mail.abc.com. IN A remain the same to the mail server.
any thing to be change the zmprov or MTA?

[abhiz]

I am not getting what you want to do exactly.Can you please explain what you want to do.

[Max Ma]

abhiz
I have the original server setup with abc.com as mx and the DNS A record also created as abc.com to point to the mail server
Which works fine for us, which user can access the mail server with both mail.abc.com or abc.com to the mail server.

However, due some some user request, we like to have the A record for abc.com point to webserver instead which cause the problem in the current mail server , the mail server try to delivery the mail to the web server instead the mail server.
And MTA configuration in the postfix need to amend in order to make the server delivery to the mail.abc.com instead of the abc.com

[Max Ma]

I should rephase the question.
I like to have host name on the server change from abc.com to mail.abc.com
which mx record will still be abc.com
How should I go about it.

many thanks