What are the Fax Size Limitations with each Fax Modality?

Instant Fax Portal

Send/Receive Fax limit: 20 MB or 100 pages (whichever comes first).

E-mail to Fax

Send/Receive Fax limit: 10 MB or 100 pages (whichever comes first).

Instant Fax ATA

There is no specific data size limitation, but it is recommended to break faxes up to 100 pages or less. Longer faxes have a higher potential to fail due to QoS.

When end-users receive faxes with a file more than 10 MB in size via Instant Fax ATA's E-mail, a link wherein you can download the file is sent instead as 10 MB is the common maximum attachment size for email.