[slantyyz]

I looked into this as an option, and it's worth mentioning - if you need email aliases, you'll need a Business 365 account, not a Personal 365 account.

The Basic (lowest tier) Business account is roughly same price as the personal 365 account, but I believe they are completely different services. If you have an existing personal 365 account, I don't believe there is a seamless switchover to a business account. You will need to create a business account separately.

[myobripicusni]

I'm looking into this too, and found the Exchange Online Plan 1 which is a dollar cheaper at 4/user/month.

I'm just trying to figure out if you can add multiple domains and aliases (that can be used for sending) with a single user license.

[rootsudo]

you can if you are on a business o365 plan, so if you get Exchange Online Plan 1, you should be able to do so.

[Osiris]

I have a Microsoft 365 Family account and in outlook there is an option to configure a personalized domain.

I haven't actually switched it yet so I can't confirm that it works, but the option is there.

[slantyyz]

From what I understand you can use a custom domain on the personal/family plans, but if you're aliasing emails (e.g. info@yourdomain, notify@yourdomain) to a single address, you need the business plans.

[syshum]

Offically you can only use the Family account on a custom domain register with GoDaddy, there are a few hacks out there to get around this but they could be broken at any time