List of trusted email address which won't have the quota restriction.

    The incoming emails have a restriction of the number of records they can
    create with alias, defined by the 2 systems parameters;
    - mail.gateway.loop.minutes
    - mail.gateway.loop.threshold

    But we might have some legit use cases for which we want to receive a ton of emails
    from an automated-source. This model stores those trusted source and this restriction
    won't apply to them.
    