Ideas needed for MX records sharing. A company used emailA.com for years and is splitting up. Now companyA needs to forward email from companyA.com to both new companies that comprise of now companyB and companyC. Is there a way to split the DNS management of the MX records on the hosting site so email is forwarded from companyA hosting (the MX records) to companyB and companyC. Both new companies do not trust the other with their email server managing the other and being responsible for forwarding to the other.
If I need to provide more information let me know.