Please add alias domain from the management interface (Add Alias Domain). You should submit the alias domain one by one. The alias domain will be activated in the backend within minutes. Please check the status from the management interface (List Alias Domains). You should have below DNS entries to make your alias domain work as expected.Hostname | Type | Value | Priority |
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@ | MX | mx.199903.xyz | 5 |
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@ | TXT | v=spf1 include:199903.xyz ?all | |
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All domains have DKIM enabled by default. If you want to send messages from the domain email, please add the correct DKIM key into your DNS system (see following question). Otherwise you may have email sent failed.