Integrating a mail server is high on our to-do list, but the core team hasn’t made any final decisions yet. I can point you to two resources.
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Current plans: One of our core developers, @sunil, made a development plan for the mail server. Read about it here: email: Improve app for managing a full mail server setup (#56) · Issues · FreedomBox / FreedomBox · GitLab
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Related project: Recently, we looked at a Debian-based mail server called projectx, and it might play a role in our development: Email Server: projectx - #4 by haidar