Run sendmail by Hand
Most users do not run sendmail directly. Instead, they use one of many MUAs to compose a mail message. Those programs invisibly pass the mail message to sendmail, creating the appearance of instantaneous transmission. The sendmail program then takes care of delivery in its own seemingly mysterious fashion.
Although most users don’t run sendmail directly, it is perfectly legal to do so. You, like many system managers, might need to do this to track down and solve mail problems.
Here’s a demonstration of one way to run sendmail by hand. First create a file named sendstuff with the following contents:
This is a one-line message.
Second, mail this file to yourself with the following command
you is your login
Here, you run sendmail directly by
specifying its full pathname. When you run sendmail, any
command-line arguments that do not begin with a
- character are considered
to be the names of the people to whom you are sending the
causes the contents of the file that you have created
(sendstuff) to be redirected
into the sendmail program. The
sendmail program treats
everything it reads from its standard input (up to the end
of the file) as the mail message to transmit.
Now view the mail message you just sent. How you do this will vary. Many users just type mail to view their mail. Others use the mh(1) package and type inc to receive and show to view their mail. No matter how ...