You cannot send international faxes using Fax Thru Email, with the exception of Canada. Fax Thru Email does not support any fax number that requires a country code (for example: 011.82.480.123.4567). You can, however, block international numbers.
Note: You cannot fax to most United States Territories or the Caribbean Islands even though they use the same North American dialing format (i.e., area code, followed by 7 digits).