Use Send Via Server

To "Settings/Registration Table."
You can use the Send Via Server setting as a condition to send to I-fax addresses.
If you are using the imageRUNNER ADVANCE C2020, depending on the region, the optional product is required to use this function. For information on the optional product, see "Optional Products Required for Each Function."
1.
Press (Settings/Registration).
2.
Press [Function Settings] → [Send] → [E-Mail/I-Fax Settings].
3.
Press [Use Send via Server].
4.
Press [On] → [OK].
Select [Off] to not use the Send Via Server setting as a condition to send to I-fax addresses.
NOTE
For I-fax, if <Send Via Server> is set to 'Off', there is no size limit on the data that is sent, even if you enter the maximum data size for sending.