0.0 d9L29Nj20475 Message accepted for delivery
...
>>> QUIT
221 remote.domain closing connection
The local sendmail sends QUIT to say it is all done. The remote machine acknowledges
by closing the connection.
Note that the -v (verbose) switchfor sendmail is most useful withmail sent to remote
machines. It allows you to watch SMTP conversations as they occur and can help in
tracking down why a mail message fails to reach its destination.
* This is called the ???hidden dot algorithm??? or ???dot stuffing??? and is documented in RFC2821.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
28 | Chapter 1: Some Basics
1.7.7 Debugging Mode (-d)
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 -v does. To see for yourself, enter the following
command line, but substitute your own login name in place of the you:
% /usr/lib/sendmail -d you < /dev/null
This command line produces a great deal of output. We won??™t explain this output
because it is explained in Chapter 15 on page 530. 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 -d switchcan be modified
to display specific debugging information.
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