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=item B<sendmail:>F<program>

Use the sendmail-compatible program.  F<program> is the absolute pathname
of the program.

=item B<smtp://>[I<USER>[B<:>I<PASS>]B<@>]I<HOSTNAME>[B<:>I<PORT>]

Send mail using SMTP.  I<HOSTNAME> is the hostname or IP address of the mail
relay to use.  I<PORT>, if supplied, is the port number to use instead of the
default 25.  Optional I<USER> and I<PASS> provide credentials, if the relay
requires authentication.

=back

=item B<-n>, B<--dry-run>

Don't actually send the message.  Verbosely print what is being done (see
the B<--verbose> option) and display the content of the message that would
have been sent.