Sender Address Access Controls

The Sender Address Access Controls is based on the envelope sender address of the mail, which most of the time matches the From: field, but not always.

The interface works similar to the Recipient Access Controls described above. Its priority is higher than that of Recipient Address Access Control. In the example, a mail with From: address user@domain.com will be denied access. Sender addresses marked in red are denied access, while those marked green are allowed.

To create a new Sender Address Access Control rule click the New Sender Address Access Control link.

Sender Address

Acceptable sender definitions are user@domain.com, domain.com and user@. ``user@'' matches all senders with name user.

Action

The pull-down menu has the option to Reject Message or Accept Message.

Once the fields have been filled in, click Create Check and the new rule will appear on the main screen below Sender Address Access Controls.

• [NOTE:]Applying the Accept Message action to a sender address gives relay access to an external user based on the From: mail header. Any external user that has knowledge of these sender addresses can easily forge this header, and gain relay access to this mail server. It is highly suggested you use pop-before-smtp before resorting to this service to permit relay access. If using this service is the only available option, then realize that the data entered here needs to be considered sensitive.