How do I send email from a Sun System (use mailx)?

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#!/bin/sh
#
# Purpose: Demonstrate how to send an email from UNIX using mailx.
############################################################
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[color green]# Example 1 - Simple:[/color]
echo "This is the body."| mailx -s "mailx Test1" jsmith@abc.com


[color green]# Example 2 - Using Variables:[/color]
SUBJECT="mailx Test2"
EMAIL_ADDRESS="jsmith@abc.com"
BODY="This is the body of the message."

echo "$BODY" | mailx -s "$SUBJECT" "$EMAIL_ADDRESS"


[color green]# Example 3 - Attached File:[/color]
SUBJECT="mailx Test3"
EMAIL_ADDRESS="jsmith@abc.com"
BODY="This is the body of the message."
ATTACHED_FILE="/etc/hosts"

cat "$ATTACHED_FILE" | mailx -s "$SUBJECT" "$EMAIL_ADDRESS"


[color green]# Example 4 - Attached File to Windows Email:[/color]
SUBJECT="mailx Test4"
EMAIL_ADDRESS="jsmith@abc.com"
BODY="This is the body of the message."
ATTACHED_FILE_DIR="/etc/"
ATTACHED_FILE="hosts"
ATTACHED_FILE_AS="hosts.txt"

unix2dos "$ATTACHED_FILE_DIR$ATTACHED_FILE" > /tmp/"$ATTACHED_FILE_AS"
uuencode /tmp/"$ATTACHED_FILE_AS" /tmp/"$ATTACHED_FILE_AS" | mailx -s "$SUBJECT" "$EMAIL_ADDRESS"
rm /tmp/"$ATTACHED_FILE_AS"