# > mail -s "Message TXT" alias<_at_>domain.gov

sendmail utility for Kerio Connect (c) Kerio Technologies s.r.o. All rights reserved.

Usage: sendmail [options] [recipient] [recipient] ...

Mail header and body are read from input,
header and body are divided by an empty line

The following options are recognized:
        -B body_type (ignored)
                The message body MIME type: 7BIT or 8BITMIME.
        -F full_name
                Set the sender full name. This is used only with messages
                that have no From: message header.
        -N dsn
                Delivery status notification control: SUCCESS, FAILURE,
                DELAY, NEVER and combinations divided by ','
        -a address
                SMTP server address. The default address is 127.0.0.1. You
                can specify antoher than the default port (25) by adding
                ':port', for example 127.0.0.1:2525
        -bm (ignored)
                Read mail from standard input and arrange for delivery. This
                is the default mode of operation.
        -f sender
                Set the envelope sender address. This is the address where
                delivery  problems  are  sent to, unless the message contains
                an Errors-To: message header.
        -i
                When reading a message from standard input, don't treat
                a line with only a . character as the end of input.
        -oi
                When reading a message from standard input, don't treat
                a line with only a . character as the end of input.
        -o x value (ignored)
                Set  option x to value.
        -p password
                Password for SMTP authentication
        -r sender
                Set the envelope sender address. This is the address where
                delivery  problems  are  sent to, unless the message contains
                an Errors-To: message header.
        -t (ignored)
                Extract recipients from message headers. This requires that
                no recipients be specified on the command line.
        -u user_name
                User name for SMTP authentication
        -v
                Enable verbose logging for debugging purposes. Multiple  -v
                options make the software increasingly verbose. For
                compatibility with sendmail, mailx and other mail submission
                software, a single -v option produces no output.
        -L tag (ignored)
                Set the identifier used in syslog messages to the supplied tag.
        -O option=value (ignored)
                Set option option to the specified value. This form uses long
                names.
        --
                Delimits options. Following arguments (if any) are treated as
                recipients, even if they begin with '-'.

#find / -name sendmail

echo "Message TXT" | mail admin@youdomian.com

mail -s "Message TXT" admin<_at_>youdomian.com

ln -s /opt/kerio/mailserver/sendmail /usr/sbin/sendmail
sendmail -F sender@domain.com  -u sender@domain.com -p password receiver<_at_>domain.com