ansible-role-disposable-mail/docs/DEPLOYMENT.md

# Mail Server: Deployment

1. Create MX and TXT records. For example, here are example records defined in dnscontrol:
    ```Javascript
    D('example.com', REG_NAMECHEAP, DnsProvider(DSP_NAMECHEAP),
        A('mail', '10.87.129.99'),
        MX('@', 10, 'mail.example.com.'),
        TXT('_dmarc', 'v=DMARC1; p=none'),
        TXT('@', 'v=spf1 mx ~all')
    );
    ```
    The `A` and `MX` records are required, while the `TXT` records are optional but recommended.

2. Configure your playbook's variables and run this playbook.

3. Configure credentials for the "hello" virtual inbox on the server. Use your favorite password manager to generate a passphrase and then run this to configure it:

    ```shell
    sudo echo hello:$(doveadm pw -s BLF-CRYPT):$(id -u maildir):$(id -g maildir) >> /etc/dovecot/imap.passwd
    ```

    Also, if you use `doas` rather than `sudo`, you need to permit your ansible_user to become opendkim in your `/etc/doas.conf`:

    ```
    permit nopass blee as opendkim
    ```

4. configure some virtual aliases in /etc/postfix/virtual and run: `postmap virtual` (See `man 5 postconf` for details)

Validate your dns records: [mxtoolbox.com](https://mxtoolbox.com/)

## Optional: sending authenticated mail

* Create another TXT record for DKIM using the contents of /etc/dkimkeys/mail.txt

    Here's an example line in dnscontrol:

    ```Javascript
    TXT('mail._domainkey', 'v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANB...QIDAQAB')
    ```

    * See [print-rdata.py](examples/print-rdata.py) for a (kind of bad) example of how to automatically parse mail.txt
    * You can codify your records in a git repo using a tool like [dnscontrol](https://dnscontrol.org/) as well as [octodns](https://github.com/octodns/octodns-easydns) 

* If you're really feeling adventurous, you could even set up a proper dmarc address to replace the original placeholder TXT record.

    ```Javascript
    TXT('_dmarc', 'v=DMARC1; p=reject; rua=mailto:dmarc@satstack.cloud; fo=1')
    ```

After records propogate, verify outbound mail using [mail-tester](https://www.mail-tester.com/) or [learndmarc](https://www.learndmarc.com/). I can score 10/10 by sending an email with an html mime type (just copypasta something from chatgpt).