We use Win2003 Server with MS DNS. Fairly new to DNS and can't seem to figure this out.

We have a client who has an A record pointed at an IP with a 3rd party service. Now they want to be able to send & receive email via user@abc.domain.com using our service.

Currently his domain has a mx record pointing at our mail server and I want to know if I can set it up so that the will work through our service.

I have copied the record in here and changed the names etc to hopefully get some insight

Zone records - domain.com ;

@ A 111.222.333.444
@ MX 10 mail.emailhost.com.
abc A 999.888.777.666
www A 111.222.333.444

So the 3rd party is abc.domain.com and everything else is hosted through us. He wants to know if he can have us setup email user@abc.domain.com and run it through our service at mail.emailhost.com.


Set up a new zone for abc.domain.com.

Add MX records into this zone which point to the mail server on your system.

Remove the abc A record from the zone for domain.com, and put it in this new zone file (for the sake of tidiness). Obviously it will be @ A ... rather than abc A when homed in this subdomain.


Yes, he can. You have to add a MX record for abc.domain.com that point to you mail.emailhost.com.

abc MX 10 mail.emailhost.com

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