# mail.netig.net

Mailserver with `Docker Mailserver` and certificates managed by `Caddy`.

## Prerequisites

Necessary DNS records :

* netig.net 	MX 	mail.netig.net
* mail.netig.net 	A 	<IPv4>
* mail.<other_domain> 	A 	<IPv4>

> Do not make AAAA record for mail.<domain> zones, otherwise your mailserver will not be able to recieve messages from Gmail (and maybe others).

Also set the reverse DNS to `mail.netig.net.`.

Get TLS certificates with Caddy and make them available through volume like this :
```
      # mail.netig.net certs
      - ../caddy/volumes/data/caddy/certificates/acme-v02.api.letsencrypt.org-directory/mail.netig.net/mail.netig.net.crt:/etc/letsencrypt/live/mail.netig.net/fullchain.pem:ro
      - ../caddy/volumes/data/caddy/certificates/acme-v02.api.letsencrypt.org-directory/mail.netig.net/mail.netig.net.key:/etc/letsencrypt/live/mail.netig.net/privkey.pem:ro
```

## Installation

Create the `mailserver` network :
```
# nerdctl network create mailserver
```

Run the compose file :
```
# nerdctl compose up -d
```

Add the `admin` email :
```
# nerdctl exec -ti mailserver setup email add admin@netig.net
```

Make the `postmaster` alias :
```
# nerdctl exec -ti mailserver setup alias add postmaster@netig.net admin@netig.net
```

Generate DKIM key (and for any added domain in the future).
```
# nerdctl exec -ti mailserver setup config dkim
```

You can see public key with this command :
```
# cat /var/local/mail.netig.net/config/opendkim/keys/netig.net/mail.txt
```

You may paste this as it is into your DNS zone.

Register also SPF :

* netig.net 	TXT 	"v=spf1 mx ~all"

And finaly the DMARC record :

* _dmarc.netig.net 	TXT 	"v=DMARC1; p=none"

Then restart Docker Mail Server :
```
# nerdctl compose down
# nerdctl compose up -d
```

## Tips

To get help :
```
# nerdctl exec -ti mailserver setup help
```

Clean Fail2ban ban list :
```
# nerdctl exec -ti mailserver fail2ban-client unban --all
```

To get TLS certs (or renew) use `netig-mail-certs-get` script. 

# Links

* https://docker-mailserver.github.io/docker-mailserver/edge