Disable automatic emails to partner

This module sets the value of the field "Opt-Out" to True for existing Partners. Newly created partners will also have the value of "Opt-Out" set to True by default.

As stated in the help comment for the field (Odoo code, module email_template): `

help="If opt-out is checked, this contact has refused to receive emails for mass mailing and marketing campaign. "

`

By installing this module, all the partners will not receive marketing emails or other kind of automated emails.