Install Mailhog

mailhog-install.sh

#!/usr/bin/env bash
set -euo pipefail

if [[ -f /usr/local/bin/mailhog ]]; then
    echo 'It seems mailhog is already installed.' >&2
    echo 'Remove </usr/local/bin/mailhog> to force reinstallation.' >&2
    exit 1
fi

if [[ "$EUID" -ne 0 ]]; then
    echo 'This script must be run with root privileges (hint: use sudo)' >&2
    exit 1
fi

echo 'Installing Mailhog...'

# These can be overridden using environment variables if needed
# e.g. `DOWNLOAD_URL=http://example.com/mailhog_v2.0 /path/to/mailhog-install.sh`
download_url="${DOWNLOAD_URL:-https://github.com/mailhog/MailHog/releases/download/v1.0.0/MailHog_linux_amd64}"
install_path="${INSTALL_PATH:-/usr/local/bin/mailhog}"

curl -LSso "$install_path" "$download_url"
chmod +x /usr/local/bin/mailhog

cat > /etc/systemd/system/mailhog.service <<EOF
[Unit]
Description=Mailhog
After=network.target

[Service]
Type=simple
ExecStart=/usr/bin/env /usr/local/bin/mailhog > /dev/null 2>&1 &

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable mailhog
systemctl start mailhog
systemctl status mailhog

# Something like this might be necessary to allow outside access.
# It will depend on what firewall you're using but this is just
# an example with ufw, to allow access to the web interface:
# ufw allow out 8025