bin/faxrcvd is the command script invoked by the facsimile server whenever a facsimile is received. It parses etc/FaxDispatch so you can customize the script by editing the parameter file.
To forward incoming facsimiles to you eMail address change FaxDispatch accordingly:

FILETYPE=pdf;
SENDTO=user@domain.tld;

Allowed values for the FILETYPE variable are ps, tif or pdf. Note that non-ASCII filetypes require an encoder (but normally your HylaFAX rpm package comes with this).

You can of course alter the bin/faxrcvd itself, but it is part of the package distribution and subject to being overwritten by subsequent upgrades.

Resources:
http://hylafax.sourceforge.net/man/faxrcvd.php