This is a setup for a Tor based mail hosting server
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General Information:

This is a setup for a Tor based email hosting server. It is provided as is and before putting it into production you should make changes according to your needs. This is a work in progress and you should carefully check the commit history for changes before updating.

Installation Instructions:

Primary mail server with Tor:

Uninstall packages that may interfere with this setup:

DEBIAN_FRONTEND=noninteractive apt-get purge -y apache2* dnsmasq* eatmydata exim4* imagemagick-6-common mysql-client* mysql-server* nginx* libnginx-mod* php7* resolvconf && systemctl disable systemd-resolved.service && systemctl stop systemd-resolved.service

If you have problems resolving hostnames after this step, temporarily switch to a public nameserver like 1.1.1.1 (from CloudFlare) or 8.8.8.8 (from Google)

rm /etc/resolv.conf && echo "nameserver 1.1.1.1" > /etc/resolv.conf

Install git and clone this repository

apt-get update && apt-get install git -y && git clone https://github.com/DanWin/mail-hosting && cd mail-hosting

Install files and programs

./install_binaries.sh

Copy (and modify according to your needs) the site files in etc to /etc after installation has finished. Then restart some services:

systemctl daemon-reload && systemctl restart tor@default.service

Replace the default .onion domain with your domain:

sed -i "s/danielas3rtn54uwmofdo3x2bsdifr47huasnmbgqzfrec5ubupvtpid.onion/`cat /var/lib/tor/hidden_service/hostname`/g" /etc/prosody/prosody.cfg.lua /etc/nginx/sites-enabled/mail /var/www/mail/common_config.php /etc/postfix/main.cf

Replace the default clearnet domain with your domain:

sed -i "s/danwin1210.de/YOUR_DOMAIN/g" /etc/prosody/prosody.cfg.lua /etc/postfix/main.cf /etc/dovecot/dovecot.conf /etc/nginx/sites-enabled/* /var/www/mail/common_config.php /var/www/mail/www/squirrelmail/config/config.php

Create a mysql users and databases:

mysql
CREATE DATABASE postfix;
CREATE DATABASE prosody;
CREATE USER 'postfix'@'%' IDENTIFIED BY 'MY_PASSWORD';
CREATE USER 'postfix_readonly'@'%' IDENTIFIED BY 'MY_PASSWORD';
CREATE USER 'prosody'@'%' IDENTIFIED BY 'MY_PASSWORD';
GRANT ALL PRIVILEGES ON postfix.* TO 'postfix'@'%';
GRANT SELECT ON postfix.* TO 'postfix_readonly'@'%';
GRANT ALL PRIVILEGES ON prosody.* TO 'prosody'@'%';
FLUSH PRIVILEGES;
quit

Then update the passwords you've set in your configuration files:

nano /etc/dovecot/dovecot-dict-sql.conf.ext /etc/dovecot/dovecot-sql.conf.ext /etc/postfix/sql/mysql_* /etc/prosody/prosody.cfg.lua /var/www/mail/common_config.php

Generate a keypair for rspamd with rspamadm keypair gen and add it to /etc/rspamd/local.d/worker-fuzzy.inc, add the public encryption key to /etc/rspamd/override.d/fuzzy_check.conf

Set a password for the web interface with rspamadm pw and add the hash for it to /etc/rspamd/override.d/worker-controller.inc

Generate DKIM signing keys and add them to /etc/rspamd/local.d/arc.conf /etc/rspamd/local.d/dkim_signing.conf, then add the printed DNS records to your domain:

rspamadm dkim_keygen -d YOUR_DOMAIN -s $(date +"%Y%m%d")-rsa -b 4096 -t rsa -k /var/lib/rspamd/dkim/YOUR_DOMAIN-rsa
rspamadm dkim_keygen -d YOUR_DOMAIN -s $(date +"%Y%m%d")-ed25519 -t ed25519 -k /var/lib/rspamd/dkim/YOUR_DOMAIN-ed25519

Create a password used for your TURN server and replace all YOUR_SECRET in /etc/prosody/prosody.cfg.lua with it.

Install acme.sh or certbot to obtain a free letsencrypt SSL certificate, then update the path to this new certificate in the following files:

nano /etc/prosody/prosody.cfg.lua /etc/dovecot/dovecot.conf /etc/postfix/main.cf /etc/nginx/nginx.conf /etc/nginx/sites-enabled/mail /etc/nginx/sites-enabled/openpgpkey

Add your other servers IP under unrestricted access to these IPs in /etc/rc.local

Create database tables, activate firewall and enable cron:

postmap /etc/postfix/header_checks
cd /var/www/mail && php setup.php && chmod +x /etc/rc.local && /etc/rc.local && systemctl enable mail-cron.timer

Generate a wireguard keypair and add the public key generated here to the primary mail server wireguard config:

export PRIV=$(wg genkey)
sed -i "s~YOUR_PRIVATE_KEY~$PRIV~g" /etc/wireguard/wg0.conf
echo $PRIV | wg pubkey

Replace YOUR_IP with the IP of your other server, then enable and start wireguard:

nano /etc/wireguard/wg0.conf
systemctl enable wg-quick@wg0 && systemctl start wg-quick@wg0

Final step is to reboot the server and check that everything is working.

Proxy server:

To send emails to the regular internet, it is necessary to have a static IP to retain a reputation with an IP+Domain mapping. If you try sending via Tor, your emails will most certainly get blocked by spam filters. For this reason we need to setup a proxy server which will hold no user data itself, but simply act as a gateway to reach the less anonymous part of the internet.

Uninstall packages that may interfere with this setup:

DEBIAN_FRONTEND=noninteractive apt-get purge -y apache2* dnsmasq* eatmydata exim4* imagemagick-6-common mysql-client* mysql-server* nginx* libnginx-mod* php7* resolvconf && systemctl disable systemd-resolved.service && systemctl stop systemd-resolved.service

If you have problems resolving hostnames after this step, temporarily switch to a public nameserver like 1.1.1.1 (from CloudFlare) or 8.8.8.8 (from Google)

rm /etc/resolv.conf && echo "nameserver 1.1.1.1" > /etc/resolv.conf

Install git and clone this repository

apt-get update && apt-get install git -y && git clone https://github.com/DanWin/mail-hosting && cd mail-hosting

Install files and programs

./install_binaries_proxy.sh

Copy (and modify according to your needs) the site files in etc_clearnet_proxy to /etc after installation has finished.

Add the password for your TURN server you created for prosody in the main server and replace YOUR_AUTH_SECRET in /etc/turnserver.conf with it.

Install acme.sh or certbot to obtain a free letsencrypt SSL certificate, then update the path to this new certificate in the following files:

nano /etc/postfix/main.cf /etc/nginx/nginx.conf /etc/turnserver.conf

Replace YOUR_PASSWORD in /etc/postfix/sql/mysql_tls_policy_out.cf with the one you've generated previously on the other server.

Generate a wireguard keypair and add the public key generated here to the primary mail server wireguard config:

export PRIV=$(wg genkey)
sed -i "s~YOUR_PRIVATE_KEY~$PRIV~g" /etc/wireguard/wg0.conf
echo $PRIV | wg pubkey

Replace YOUR_IP with the IP of your other server and ens3 with your network interface name, then enable and start wireguard:

nano /etc/wireguard/wg0.conf
systemctl enable wg-quick@wg0 && systemctl start wg-quick@wg0

Edit and create your admin user with the following script:

nano /var/www/mail/tools/create_admin.php
php /var/www/mail/tools/create_admin.php

Copy the file /etc/postfix/danwin1210-mail.crt from your main server to the same location on the proxy server.

Final step is to reboot the server and check that everything is working.

General Domain settings

Add the following DNS records to your domain, with the IPs of your proxy server:

@    IN    TXT    "v=spf1 ip4:your.ip.v4.address ip6:your:ip:v6:address -all"
_dmarc    IN    TXT "v=DMARC1;p=quarantine;adkim=r;aspf=r;fo=1;rua=mailto:postmaster@yourdomain;ruf=mailto:postmaster@yourdomain;rf=afrf;ri=86400;pct=100"
_adsp._domainkey	IN	TXT	"dkim=all;"
_domainkey	IN	TXT "o=-;r=postmaster@yourdomain"
*._report._dmarc	IN	TXT "v=DMARC1"
_mta-sts    IN  TXT "v=STSv1; id=2024060601"
_smtp._tls  IN  TXT "v=TLSRPTv1; rua=mailto:postmaster@yourdomain"
_imaps._tcp	IN	SRV	0 0 993 yourdomain.
_submission._tcp	IN	SRV	0 0 465 yourdomain.
@	IN	MX	0 yourdomain.
@	IN	A	your.ip.v4.address
@	IN	AAAA	your:ip:v6:address
www	IN	A	your.ip.v4.address
www	IN	AAAA	your:ip:v6:address
mta-sts	IN	A	your.ip.v4.address
mta-sts	IN	AAAA	your:ip:v6:address
conference	IN	A	your.ip.v4.address
conference	IN	AAAA	your:ip:v6:address
proxy	IN	A	your.ip.v4.address
proxy	IN	AAAA	your:ip:v6:address
upload	IN	A	your.ip.v4.address
upload	IN	AAAA	your:ip:v6:address
_xmpp-server._tcp.conference	IN	SRV	5 0 5269 yourdomain.
_xmpp-server._tcp.conference	IN	SRV	0 0 5269 your_onion_domain.
_xmpp-client._tcp	IN	SRV	5 0 5222 yourdomain.
_xmpp-client._tcp	IN	SRV	0 0 5222 your_onion_domain.
_xmpps-client._tcp	IN	SRV	5 0 5223 yourdomain.
_xmpps-client._tcp	IN	SRV	0 0 5223 your_onion_domain.
_xmpp-server._tcp	IN	SRV	5 0 5269 yourdomain.
_xmpp-server._tcp	IN	SRV	0 0 5269 your_onion_domain.
_stun._udp	IN	SRV	0 0 3478 yourdomain.
_turn._udp	IN	SRV	0 0 3478 yourdomain.
_stun._tcp	IN	SRV	0 0 3478 yourdomain.
_stuns._tcp	IN	SRV	0 0 3479 yourdomain.
_turn._tcp	IN	SRV	0 0 3478 yourdomain.
_turns._tcp	IN	SRV	0 0 5349 yourdomain.
_xmppconnect	IN	TXT	"_xmpp-client-xbosh=https://yourdomain:5281/http-bind"
_xmppconnect	IN	TXT	"_xmpp-client-websocket=wss://yourdomain:5281/xmpp-websocket"

Set the PTR record of your proxy servers IPs to your domain. This can usually be done from your hosting panels configuration, but may not be available with every hosting provider, where you can then request them to do it via a support ticket.

Consider registering your domain with DNSWL, SNDS, Google Postmaster Tools and YahooCFL for valuable insights into your delivery.

Consider enabling DNSSEC on your domain, when available by your Domain registrar. Some registrars may charge extra for it. Once enabled, you can also enable DANE, which increases security. Use TLSA Record Genearator to help you create an appropriate DNS record.

Consider adding your domain to HSTS Preload List which will prevent browsers from even trying to access your domain on the insecure http:// protocol and automatically upgreade to https://

Final configuration steps

Follow SnappyMail installation instructions to finish setting it up at yourdomain/mail/snappymail/?admin

Translating:

Translations are managed in Weblate. If you prefer manually submitting translations, the script update-translations.sh can be used to update the language template and translation files from source. It will generate the file locale/mail-hosting.pot which you can then use as basis to create a new language file in YOUR_LANG_CODE/LC_MESSAGES/mail-hosting.po and edit it with a translation program, such as Poedit. Once you are done, you can open a pull request, or email me, to include the translation.

Live demo:

If you want to see the script in action, and/or register for a free anonymous E-Mail address, you can visit my Tor hidden service or my clearnet proxy if you don't have Tor installed.