The mailstats command was invoked with improper command line options. The valid options are:

-C

Read the configuration file, cffile, instead of the default sendmail configuration file.

-P

Output the information in program-readable mode without clearing statistics.

-f

Read the statistics file, stfile, instead of the statistics file specified in the sendmail configuration file.

-o

Do not display the name of the mailer in the output.

-p

Output the information in program-readable mode and clear statistics.