Here is my setup ISP hosts abc.com and ISP SMTP server hosts mail accounts 1 - 20 are XXXX@abc.com, I want to use sme server to create 21-100 xxxx@abc.com and have both smtp servers in use with separate mailboxes.
I got the ISP to add
abc.com. IN MX 20 host.abc.com.
host.abc.com. IN A 10.10.10.2
to their DNS
this is what they originally had
abc.com. MX preference = 10, mail exchanger = smtp10.bellnexxia.net
smtp10.bellnexxia.net internet address = 206.47.199.31
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