C.6. Mail2Fax Settings

A subscriber can restrict access to his Mail2Fax service with some methods, those can also be combined:

using a secret key that is only known to him, and is inserted in every mail that he sends to NGCP to be forwarded as fax
using an access control list (ACL) that determines from which endpoint and for which destination a mail-to-fax is accepted by NGCP platform
Secret Key: the secret key used to validate the sender of an e-mail; not used if left empty
Secret Key Renew: secret key renewal period; NGCP platform will enforce renewal of the secret key when the defined time has elapsed
Last Secret Key Modify Time: information about the last secret key modification time
Secret Key Renew Notify: an e-mail address where the notification about secret key modification is sent
ACL: access control list, see the details below; this is a list of access control rules

Figure C.3. Mail2Fax Access Control List

The parameters for access control rules:

From email: this sender is allowed to use Mail2Fax service
Received from IP: this IP address or host name must be present in From e-mail header
Destination: either a complete phone number in E.164 format, or a regular expression ("Use Regex" checkbox must be ticked) that may define a range of numbers. Examples: "4313334445" as a single number; "^4399.+" as a regular expression: all destinations starting with "4399"


	When neither Secret Key, nor ACL is defined then Mail2Fax service will deny accepting any e-mail for sending faxes!