Advice on Google Domains and Bluehost hosting
once you switch your nameservers, the email routing for your domain is set from your Bluehost cPanel. those same email forwarders will need to be set up there. Anything set up at Google previously will no longer be referenced when a server determines how to route the mail sent to an address at your domain.
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Today I purchased Workspace to get an gmail with a custom domain. It works just fine, but workspace is pretty expensive, especially since I’m paying for a bunch of google services that I won’t use.
Previously, I tried email forwarding with cloudfare and it worked great. However, I had one case where Gmail gave a spooky yellow warning to the recipient of an email I’d sent. I can’t afford to have my email seem suspicious or spam since I intend to use this email for work. I’m also sad I can’t set a profile picture when forwarding emails.
Is there a clear and concise way to configure email forwarding such that it complies with every header and all email clients are happy? In the mean time, I’m too paranoid to use it for fear that my emails will be flagged or removed.
You can, but it's not a straightforward setup. The big issue is that your MX record can only point at one email system, so you effectively need a method to distribute messages between Google and M365. Generally speaking, it will be much easier if you use a separate domain (or a subdomain), and an acceptable alternative is to also use the default domain you are given with the service (in the case of Exchange Online, it will be companyname.onmicrosoft.com).
If you do plan to use the same domain in both systems, you need to ensure that users are represented correctly in each system, and that some sort of "forwarding" handles the mail delivery to the correct mailbox. There are some guidelines here: https://learn.microsoft.com/en-us/microsoft-365/admin/misc/pilot-microsoft-365-from-my-custom-domain?view=o365-worldwide
I am doing the same for this topic. Currently MX records point to Exchange Online. A user on the google domain but not on Exchange could receive Emails from Exchange. But fail on sending Email from Google SMTP to Exchange. Google SMTP IP vary a lot and it is hard to setup into EAC connector. Another way to use certificate file to authenticate with Exchange online is not supported by Google.
Any idea?