

Now i got Microsoft 365 Family and i switched the DNS entries for my domain to Microsoft Family with the procedure under "personalized email address". I had a microsoft personal account with for years (therefore it was my windows account login), while those the email address was configured with gmail. Office 365: Send using Mailbox Alias Addresses You can now send mail using any of the addresses on your mailbox. Business accounts can host multiple domains (in the thousands), and each mailbox can have multiple addresses in one or more domains. If you want to add addresses in another domain, you will need a business Microsoft account (or another subscription in a different Microsoft account).

I tried using this method to add a domain address to accounts not in the family share – incoming mail did not work. on the web sends mail on behalf of the addresses. Outlook desktop sends from one of my extra addresses, but another alias is listed an EASI address in Outlook desktop and cannot send mail (from Outlook desktop). Incoming email to the additional aliases works fine but it's hit or miss for sending messages from the address. But you can add more aliases in your custom domain if you can forward the domain email temporarily so you can verify the address. You (and the people you share Family with) are limited to one alias in the custom domain.


Please note: you need the dot at the end of the external domains. Some DNS servers use TTL (time to live) in seconds, other use hours. Go to your own domain DNS settings and add the following settings, replacing "mxRecordValue" in the DNS samples below with your code from the URL. You need the mxRecordValue code from the URL.
