gnu-social/docker/mail/rootfs/usr/bin/new-alias.sh

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#!/bin/sh
USAGE="Usage: $0 ALIAS TARGET";
if [ -z "$2" ]
then
echo "$USAGE";
exit 1;
fi
DOMAINPART=$(echo $1 | sed -e "s/^.*\@//")
if ! grep "^$DOMAINPART\s" /etc/mail/domains &> /dev/null; then
echo "This server is not responsible for the domain of this alias."
exit 1
fi
echo -e "$1\t\t$2" >> /etc/mail/aliases
postmap /etc/mail/aliases
postfix reload
echo "Alias added."