#!/bin/bash

################################################################
# Prerequisites 
################################################################

# Ensure we are up-to-date and have required software installed
yum update -y
yum install postfix python-virtualenv -y

# Create user for handling mail
useradd -m -s /sbin/nologin incoming

################################################################
# Setup postfix
################################################################

# Remove defaults that may interfere
sed -i -e 's/^\s*\(inet_interfaces\s*=\)/#\1/' \
       -e 's/^\s*\(mydestination\s*=\)/#\1/' \
       -e 's/^\s*\(mynetworks\s*=\)/#\1/' \
       -e 's/^\s*\(home_mailbox\s*=\)/#\1/' \
       -e 's/^\s*\(alias_maps\s*=\)/#\1/' \
       /etc/postfix/main.cf

# Configure postfix
cat <<EOF >> /etc/postfix/main.cf
# HOSTING CONFIG FOR EMAIL PARSING
inet_interfaces = all
mynetworks = 127.0.0.1/32
virtual_alias_maps = regexp:/etc/postfix/virtual_aliases
virtual_alias_domains = accounts.hosting.com
home_mailbox = Maildir/
EOF

# Disable ALL bounces
sed -i 's/^\(bounce\s.*\)bounce$/\1discard/' /etc/postfix/master.cf

# Write aliases for users we want to handle mail for
cat <<EOF > /etc/postfix/virtual_aliases
/^[0-9]+-[0-9]+@accounts\.hosting\.com$/  incoming
/^support@accounts\.hosting\.com$/        incoming
EOF

# Restart postfix
systemctl restart postfix

################################################################
# Setup mailparser environment
################################################################

# Setup virtualenv from which we will run everything
# (this helps prevent yum from breaking functionality) 

sudo -u incoming bash -c " \
	virtualenv ~incoming/venv \
	source ~incoming/venv/bin/activate \
	pip install mailbox requests \
	"