gmail.sh

#!/bin/bash
function gmail() {
    from=$1
    user=$1
    to=$2

    stty -echo </dev/tty;
    read -p "Password: " passw < /dev/tty
    echo
    stty </dev/tty echo

    opts="-S smtp-use-starttls \
    -S ssl-verify=ignore \
    -S smtp-auth=login \
    -S smtp=smtp://smtp.gmail.com:587 \
    -S from=$from \
    -S smtp-auth-user=$user \
    -S smtp-auth-password=$passw \
    -S ssl-verify=ignore"

    mailx -v $opts $to $@
}

gmail $1 $2

Now accepts a second argument which is the recipient of the email.

Fixed syntax problems and made the email address an argument.