@Geuppiopru50
1. What is the @xxxx.ch domain name for the mailbox? Can it be masked somehow and differentiated from @Bluewin.ch?
No, for new addresses the domain is @bluewin.ch
2. Will you accept the migration of my email, hosted on the other domain, to the newly created bluewin mailbox?
Yes, this can be done manually from the other domain using an external mailbox (e.g. Thunderbird), or you can activate automatic and permanent transfer to @bluewin.ch
3. Do you accept messages transferred from external mailboxes?
Yes, activate the transfer from the external mailbox to the @bluewin.ch mailbox