Debugging Flags

Debugging Flags

Several debugging flags are built into sendmail. Each flag includes a number and a level. The number identifies the debugging flag. The level, which defaults to 1, dictates how much information prints. A low level causes minimal information to print; a high level causes more comprehensive information to print. In general, levels greater than 9 cause so much information to print that it is of limited value. Debugging flags use the following syntax:

-d debug-list

A debug list includes the flag number and the flag level, as shown in the following examples.

Set flag 13 to level 1.
-d13
Set flag 13 to level 3.
-d13.3
Set flags 5 though 18 to level 1.
-d5-18
Set flags 5 through 18 to level 4.
-d5-18.4

Many debugging flags are of little use to the average sendmail user. Some are occasionally useful for helping to track down obscure problems. "Flags, Options, and Files" includes a complete list of debugging flags.