Operations grimoire/Mail

The mail infrastructure is shared between third party services (Mailgun, Sendgrid) for web applications willing to use API and our own mail server for regular mailboxes.

Operations grimoire/Mail

• Operations grimoire/Mail/DKIM
• Operations grimoire/Mail/Implementation discussions
• Operations grimoire/Mail/Sympa

Third party services

Mainly, they provide configuration wizards, logs, and API keys on a web interface.

Operations grimoire/External services says who to contact to debug any issue, configure them, etc.

Nasqueron mail services

Architecture

We use the following servers:

• Postfix
  • 25 is for mail servers
  • 587 is for STARTTLS + user auth
• dovecot for IMAP / POP ✅
• SpamAssassin, OpenDKIM (see /DKIM) 🚧🔨⏳
• Sympa for the mailing lists 🚧🔨⏳
• PostgreSQL on cluster db-A to store user accounts mailboxes ✅
• MariaDB on cluster db-B to store sympa data 🚧🔨⏳
• nginx to serve web applications ✅

When not specified otherwise, the services are located on Hervil.

The services with ✅ belong to the new installation and works correctly.

The services with 🚧🔨⏳ belong to the old installation and are being reinstalled as part of the Mail project on DevCentral.

User accounts are stored in a database. They are managed by ViMbAdmin (on https://admin.mail.nasqueron.org).

Sympa manages the mailing lists.

Add a domain

1. Add it to https://admin.mail.nasqueron.org
2. Follow /DKIM procedure

It's ready.

You can also be willing to declare the domain to autoconfig/autodiscover, but that's blocked by https://devcentral.nasqueron.org/T1116.

Hervil

Network

Routing tables

   Internet:
   Destination        Gateway            Flags     Netif Expire
   default            51.210.99.254      UGS        vmx1
   51.210.99.254      link#2             UHS        vmx1
   51.255.124.8/30    172.27.27.1        UGS        vmx0

For SPF record we need to make the mail go out from the ip : 51.210.99.254 To permit acme.sh we make a route thrugh router.OO1

Troubleshoot

Dashboards

On Grafana, the following dashboards are available:

• Postfix

The following dashboards are missing, feel free to create one:

• Dovecot

Logs

On FreeBSD servers, mail logs are consolidated into /var/log/maillog by syslog daemon.

Test to send e-mail with telnet or openssl clients

You can test STARTTLS with openssl s_client:

   openssl s_client -connect mail.nasqueron.org:587 -starttls smtp -ign_eof -crlf 

Flags:

 * The -starttls smtp option is the one to send the STARTTLS command
 * The -ign_eof flag disables interactive commands, to avoid to renegotiate the TLS session when you press R (like in RCPT TO).
 * The -crlf flag doesn't seem needed on FreeBSD, but seem needed on Fedora. It allows to always use \CR\LF (\r\n) as EOL.

@nasqueron.org must be sent through mail.nasqueron.org

A SPF record v=spf1 a:mail.nasqueron.org -all should exist.

If set, any application app.nasqueron.org should:

• send mails using @app.nasqueron.org domain, not the generic @nasqueron.org one;
• define SPF and if possible DKIM records for this @app.nasqueron.org mail domain.

Can't reach ACME DNS API

If you got a 403 by running acme.sh (only visible in --debug mode), the IP of the server isn't in geo_nasqueron.

Add a route to use router-001 gateway: route add 51.255.124.8/30 172.27.27.1

Brute-force attacks

You can block individual IP or a range with pf, see Operations grimoire/Firewall.