How to Set Up Email for a Custom Domain on Two Different Servers?

Without knowing the specific productivity suite you're using, I recommend checking their knowledge base for configuring email co-existence. This can often give you the best guidance for your setup.

In the case of Microsoft Exchange, you might need to adjust your accepted domain settings from Authoritative to Relay on both systems to route emails correctly. This change is essential for proper email flow between the two servers.

This setup isn't inherently an issue; it's just how SMTP is designed. You could consider adding another domain for forwarding, but that might get complicated. It's best to keep it simple if possible.

What you're looking for is known as split delivery or split mail routing. Since MX records can only point to one server, all emails for your domain will go to that first server. You'll need to set up Suite A to forward emails for your specific address to Suite B. Each person can then send mail from their respective servers directly. One critical thing to keep in mind is to ensure that your SPF records include both servers to avoid any outbound email issues.

Email is only deliverable to one platform, so it can be tricky to manage two different servers. Check if either platform allows free forwarding. You might need an additional domain just for routing between the two servers. Ultimately, the easiest path would be to unify all users on the same platform to avoid complications down the line.