mail -s "test email" email@example.com
This is a test
and received some errors:
collect: Cannot write ./dfg7L1sl6t000695 (bfcommit, uid=501, gid=25): Permission denied
queueup: cannot create queue temp file ./tfg7L1sl6t000695, uid=501: Permission denied
Which I take to mean the mqueue and clientmqueue dirs in /var/spool
Just thought this would be helpful.