As a coordinator/admin I want to be able to send emails to my volunteers

Administrators and Coordinators should be able to use a mailer. For administrators they can mail to all emails or specific ones based on a filter. Coordinators can only email emails in their selected group. This mailer should be on it's own view and should be an available permission. The list of emails/accounts should be shown in a table with filters for required columns.

Ideally use some templating for the mailer so it is easy for people to design the emails.

first step - user filter and email sending
second step - include email templating (markdown?)

No files or tests are identified. Start by tracing the existing administrator, coordinator, group, permission, filtering, and mailer entry points; implement the stated first step before considering templating. Done means administrators can filter recipients broadly or specifically, coordinators can email only their selected group, and the permission and recipient table are available.

Written by the indexing model from the issue text.