Emalias -- shell script to quickly generate Postfix email aliases

emalias.sh

#!/usr/local/bin/zsh

default_address="you@example.com"
if [ -t 0 ]; then
# read more about heredocs (the <<ENDSSH ... ENDSSH part): https://en.wikipedia.org/wiki/Here_document
ssh you@$EMAIL_SERVER_IP <<ENDSSH 
echo "$1@example.com $default_address" | sudo tee -a /etc/postfix/virtual \
&& sudo postmap /etc/postfix/virtual \
&& sudo service postfix restart
ENDSSH
# assumes passwordless sudo. See here if you need to set this up: https://askubuntu.com/questions/147241/execute-sudo-without-password
else
    echo "oops"
fi