Sometimes it is nice to send a log or some other file as a email to someone (or a part of a file)
cat myfile.txt | mail -s 'SUBJECT' firstname.lastname@example.org;
Change myfile.txt, SUBJECT and email@example.com to something useful.
It is also possible to send the output of a command to someone
ps -ef|mail -s 'SUBJET' firstname.lastname@example.org;