cannot send email from my custom email domain @[Moderator note: personal info removed].onmicrosoft.com

Question

many, but not all, recipient domains will not accept email from my office 365 mailbox

gmail.com works

amazon.com and shaw.ca do not

Answer 1

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data. 

Hi SteveO

Based on your information, the email address you are using (@xxxxx.onmicrosoft.com) can only exist within a Microsoft 365 Business account. It is separate from and not connected to your Family subscription.

Since this is a public platform, I’ve sent you a private message to avoid exposing any personal or organizational information. Please check it at your convenience.

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Answer 2

this family plan subscription was started long before the myriad of DNS records were required to support secure email communications

I don't seem to have access to the admin center with my family plan account to go check what my mail DNS records were properly registered.