Migration of email account to addon domain on new Web Host

Question

I took over the work from another web developer and try to figure out, how he migrated an email account from old Webhost + Domain (domainA, hostA) to a new Webhost + Domain (domainB, hostB).

This is the configuration:

domainA

• website: domainA.example on hostA
• email account: [email protected]

domainB

• website: domainB.example on hostB
• email account: [email protected] (yes, domainA)

domainA is added as addon domain on hostB. When I send an email to [email protected] the email only appears on web server B (I can see it in File Manager) not on web server A.

HostingA is cancelled the next week. (including the domainA). It seems, that I cannot manage the domainA in the admin panel anymore, but I think he did it before the cancellation.

I tried to find out how this "redirecting" of the emails works, by searching some redirecting settings on admin panel + cpanel on hostA but I just can't find it.

So, how did he do that?

I'd be happy for any explanations. I want to unterstand this because I want to renew the registration of domainA and wants to be sure, that the email address [email protected] will still work after accomplished cancellation of hostingA next week.

Answer 1

I checked the MX records in the zone editor of where I thought domainA's DNS was hosted and found it was pointing to hostA.

But I discovered that domainA's DNS had been moved to another host.

When I checked the MX records of domainA at intodns.com I discovered that the active DNS is hosted at hostB. So I was originally looking in the wrong place.