Debugging sendmail

There is a fairly large number of debug flags built into sendmail. Each debug flag has a number and a level, where higher levels cause more information to be printed out. The convention is that levels greater than nine are not required. They print out so much information that you would not normally want to see them, except for debugging that particular piece of code. Debug flags are set using the sendmail -d command-line flag. The syntax is:

debug-flag:

-d debug-list

debug-list:

debug-option [ , debug-option ]*

debug-option:

debug-range [ . debug-level ]

debug-range:

integer | integer - integer

debug-level:

integer

-d12

Set flag 12 to level 1.

-d12.3

Set flag 12 to level 3.

-d3-17

Set flags 3 through 17 to level 1.

-d3-17.4

Set flags 3 through 17 to level 4.