The sendmail program can also produce debugging output.
The sendmail program is placed in debugging mode by using the
-d command-line switch.
That switch produces far more information than
To see for yourself, enter the following command line, but substitute
your own login name in place of the
This command line produces a great deal of output. We won't explain this output, because it is explained in Chapter 37, Debugging with -d. For now just remember that the sendmail program's debugging output can produce a great deal of information.
In addition to producing lots of debugging information, the
switch can be modified to display specific debugging
information. By adding a numeric argument to the
can be limited to one specific aspect of the sendmail program's
Type in this command line, but change
to your own login name.
-d40 is the debugging switch with
a category of
40. That category limits sendmail's
program output to information about the queue.
The following output shows you some information about how your
mail message was
A detailed explanation of this output is covered in
Section 37.5.138, -d40.1.
>>>>> queueing GAA14008 (new id) queueall=1 >>>>> queueing 95688=you: mailer 4 (local), host `' user `you', ruser `<null>' next=0, alias 95460, uid 0, gid 0 flags=6008<QPRIMARY,QPINGONFAILURE,QPINGONDELAY> owner=(none), home="/home/you", fullname="Your FullName" orcpt="(none)", statmta=(none), rstatus=(none) <<<<< done queueing GAA14008 <<<<<
In addition to a category, a level may also be specified. The
level adjusts the amount of output produced. A low level produces
little output; a high level produces greater and more complex
output. The string following the
-d has the form
For example, enter the following command line:
/usr/lib/sendmail -d0.1 -bp
-d0 instructs sendmail to produce general
debugging information. The level
.1 limits sendmail
to its minimal output. That level could have been omitted, because
.1 is the default. Recall that
causes sendmail to print the contents of its queue.
The output produced looks something like the following:
Version 8.8.4 Compiled with: LOG NAMED_BIND NDBM NETINET NETUNIX NIS SCANF XDEBUG ============ SYSTEM IDENTITY (after readcf) ============ (short domain name) $w = here (canonical domain name) $j = here.us.edu (subdomain name) $m = us.edu (node name) $k = here ======================================================== Mail queue is empty
-d0.1 switch causes sendmail to print
its version, some information about how it was compiled, and
how it interpreted your host (domain) name.
Now run the same command line again, but change the level
/usr/lib/sendmail -d0.11 -bp
The increase in the level causes sendmail to print more information:
Version 8.8.4 Compiled with: LOG NAMED_BIND NDBM NETINET NETUNIX NIS SCANF XDEBUG OS Defines: HASFLOCK HASGETUSERSHELL HASINITGROUPS HASLSTAT HASSETREUID HASSETSID HASSETVBUF HASUNAME IDENTPROTO IP_SRCROUTE Config file: /etc/sendmail.cf Pid file: /etc/sendmail.pid canonical name: here.us.edu UUCP nodename: here a.k.a.: [18.104.22.168] ============ SYSTEM IDENTITY (after readcf) ============ (short domain name) $w = here (canonical domain name) $j = here.us.edu (subdomain name) $m = us.edu (node name) $k = here ======================================================== Mail queue is empty