This function changes an email address's quota.
uapi --output=jsonpretty \ --user=username \ Email \ edit_pop_quota \ email='user' \ domain='example.com'
{- "apiversion": 3,
- "func": "edit_pop_quota",
- "module": "Email",
- "result": {
- "data": null,
- "errors": null,
- "messages": null,
- "metadata": { },
- "status": 1,
- "warnings": null
}
}