Brother MFC-9120CN - Manual (Page 156)

Printing and Faxing
148
7
Sending a fax (MFC-9120CN and MFC-9320CW only)
7
Macintosh
7
You can send a fax directly from a Macintosh application.
Note
Fax documents will be sent in Black and White only.
a Create a document in a Macintosh application.
b From an application such as Apple TextEdit, click File, then Print.
 (Mac OS X 10.3.9 to 10.4.x)