The format of the .mailmap file is described in git-shortlog's man page
under "MAPPING AUTHORS".
--- /dev/null
+Alberto Gomez-Casado <a.gomezcasado@tnw.utwente.nl> albertogomcas <devnull@localhost>
+Massimo Sandal <devicerandom@gmail.com> devicerandom <devnull@localhost>
+Fabrizio Benedetti <fabrizio.benedetti.82@gmail.com> fabrizio.benedetti.82 <devnull@localhost>
+Rolf Schmidt <rschmidt@alcor.concordia.ca> illysam <devnull@localhost>
+Marco Brucale <marco.brucale@unibo.it> marcobrucale <devnull@localhost>
+Pancaldi Paolo <pancaldi.paolo@gmail.com> pancaldi.paolo <devnull@localhost>