Apple Fax - Manual (Page 39)

The status of a fax is Sent for a fax that has been sent
successfully, Deferred for a fax that is waiting to be sent at a
later time, or Failed, if the fax could not be sent for some
reason. For a Failed fax, Apple Fax shows you the number of
recipients to whom the fax could not be sent. For example,
Apple Fax shows a status of “1 of 3 failed” for a fax that you
sent to three recipients and was sent successfully to two of
them. In addition, the icon at the far left of the display is
different depending on the status.
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Deferred fax
Failed fax
Successfully
sent fax