To receive incoming email on your platform-hosted mailbox while your domain is managed elsewhere, add three MX records (and make sure the values match exactly):
Tip: If your DNS editor prefers a grid view, use the table below as a visual checklist:
MX @ mailme.enter-system.com 0 MX @ mailme.enter-system.com 10 MX @ mailme-backup.enter-system.com 20