E-Mail Issues

Recently I made some changes to one of the domains I manage for work and how their e-mail is hosted. Now I'm having an odd issue I do not know how to correct.

I took domain xxx.com and moved it to a different host. This domain requires the A-record to be pointed to a specific IP (and no problems here). Originally with the first host, the mail.xxx.com MX Entry had to be changed to the IP address of the server so that email would still work. Now with the new host, we just set it to their mail server (ex. mail.abc.com).

Now here's the odd part. We receive messages from both mail servers (mail.xxx.com and mail.abc.com). The nameservers are set to the new hosts servers. There is not a pattern with how these messages are handled.

How can I correct this issue? I'm afraid to cancel the older hosting account since it is still receiving email on a regular basis, and this domain needs to be receiving all messages.

Any ideas?? Thanks!!

 

 

 

 

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