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Google Workspace has a free shared mailbox too — it’s just called a Group
Workspace bills per user and sells nothing called a shared mailbox, so people assume a second inbox means a second seat. Groups do the same job for free — with one setting that decides whether any of it works.
Microsoft, Google or neither: choosing a host per domain
Once a domain can go on either host, the deciding factor is rarely the mail features. Three questions that settle it — and why most of a portfolio should have no inbox at all.
Run email for many domains on one Microsoft 365 license
Microsoft bills per license, not per domain. Here’s how free shared mailboxes let you give every domain its own inbox in Outlook — and where Postmark fits for transactional mail.
Making M365 and Postmark share a domain (SPF, DKIM, Return-Path)
You can receive human mail through Microsoft and send transactional mail through Postmark on the same domain. The trick is one merged SPF record and non-conflicting DKIM.