Debugging sendmail

Debugging sendmail using the -d option is described in the sendmail Nutshell Handbook published by O'Reilly & Associates, Inc. To review briefly, you can get debugging information by specifying sendmail with the -d option followed by X. To limit the output of sendmail -d to a specific aspect of sendmail's behavior, you can specify a category optionally followed by a dot (.) followed by a level from 0-9, with 9 meaning the most information. Category 75, which is unique to the Trusted Solaris version of sendmail, selects Trusted Solaris debugging information.