A shell that sends mail via SMTP with username password

#!/bin/bash

Smail () {
        smtp= "mail.mailadd.com 25" # Mail server address +25 port
        smtp_domain= "mailadd.com" # Send the domain name of the mail,
        from= "xxx@mailadd.com" after @ @ Send mail address
        rcptto=$1 # recipient address
        username_base64= "Xxxxxxxxxxxxxxxxx" # User name base64 encoding
        password_base64= "xxxxxxxx" # Password base64 encoding
        local_ip= ' ifconfig|grep bcast|awk-f: ' {print $} ' |awk-f "" ' {print} ' |head-1 '
        local_name= ' uname-n '
        (for I in "Ehlo $smtp _domain" "AUTH LOGIN" "$username _base64" "$p Assword_base64 "" MAIL from:< $FROM > "" RCPT to:< $RCPTTO > "DATA";d o
                echo $i sleep
                4 done
        echo "subject:server alert"
        echo "from:< $FROM >"
        echo "to:< $RCPTTO >"
        echo
        " echo "Server $local _name up, IP: $local _ip"
        echo. "
        Sleep 2
        echo "quit") |telnet $smtp
}
smail xxx@163.com # Here The parameter is the receipt address