Mail provisioning feature

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The Nextcloud Mail app allows admins to provision accounts. This feature is currently not documented in the admin manual.

Notes

• Please be patient: this is a large open source project that is overseen by a mixture of volunteers and non-volunteers which are all ultimately busy.
• If your suggestion is a troubleshooting scenario or one you're not 100% certain about, please post for feedback on the Nextcloud Help Forum first.
  • Then return here to bring back your experience to help improve the documentation for clarity, etc. (and link back to the forum discussion in your report!)

Protip: If you want to help move things along (or just help out in other ways too) here are some suggestions:

• Look for areas where you can assist - even seemingly unrelated areas - because doing so frees up resources for your favorite topics and ideas.
• Submit a proposed change - that attempts to addresses your issue - as a pull request.
• Participate in a discussion on some other unresolved submitted idea ("issues") to help move it along.
• Post a comment or review on someone else's proposed change ("pull request") to help move it along.

Start by locating the Nextcloud Mail app's account-provisioning behavior and the admin manual section where app administration is documented. Document how admins provision accounts; the work is complete when this feature is covered in the admin manual. No file or test is specified in the issue.