Mailing module: mail limits management #47
Description
Professional mailing services (e.g. Mailgun) bill their users for the number of sent e-mails. The administrators of Cantiga shall be able to set limits for the number of e-mails sent by particular projects, to ensure that the budget for mailing is not exceeded.
Each project, group and area shall have a mail limit: the limit of e-mails the members of the place can send. In addition to the default limit that is granted, when the place is created, it shall be possible to grant mail packs that increase the limit. All the granted packs shall be recorded, and the full history shall be available to the administrators.
The design shall allow introducing the system for buying new mail packs directly by project/group/area leaders in the future.