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.