This would cause an error because the remote machine wouldn??™t
find here in its domain remote.domain. This is one reason why it is important for your
sendmail to always use your machine??™s fully qualified hostname. A fully qualified
name is one that begins with the host??™s name, followed by a dot, then the entire DNS
domain.
If all has gone well so far, the local machine sends the name of the sender of the mail
message and the size of the message in bytes:
>>> MAIL From:
SIZE=4537
250 2.1.0 ... Sender ok
Here, that sender address was accepted by the remote machine, and the size was not
too large.
Next, the local machine sends the name of the recipient:
>>> RCPT To:
250 2.1.5 ... Recipient ok
If the user you were not known on the remote machine, it might reply with an error
of ???User unknown.??? Here, the recipient is ok. Note that ok does not necessarily mean
that the address is good. It can still be bounced later. The ok means only that the
address is acceptable.
After the envelope information has been sent, your sendmail attempts to send the
mail message (header and body combined):
>>> DATA
354 Enter mail, end with "." on a line by itself
>>> .
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc.
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