All command-line arguments that follow the
switches (if any) are taken to be the addresses of recipients. The
addresses in the list can be separated by spaces, by commas, or by
addr1 addr2 addr3
addr1, addr2, addr3
Certain modes specified by the -b command-line
switch, such as -bp (for print the
queue's contents), cause
sendmail to ignore any list of recipients.
Be sure to escape any characters in addresses that have special
meaning to your shell. For example, because the !
character has special meaning to the C shell,
it should be escaped by preceding it with a backslash character:
If sendmail expects a list of recipients and
finds none, it prints the following message and exits:
Recipient names must be specified
Note that under some circumstances, sendmail
might try to collect the message before issuing this error.