Mail Server: Deployment

Create MX and TXT records. For example, here are example records defined in dnscontrol:

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.

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:
```
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
```
configure some virtual aliases in /etc/postfix/virtual and run: postmap virtual (See man 5 postconf for details)
Configure your playbook's variables and run this playbook.

(should be fixed) Troubleshooting: Sanity check opendkim, the unix socket should exist and be writable
```
ls -AlF /var/spool/postfix/opendkim/opendkim.sock
```

Validate your dns records: 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:
```
TXT('mail._domainkey', 'v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANB...QIDAQAB')
```
- See 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 as well as octodns
If you're really feeling adventurous, you could even set up a proper dmarc address to replace the original placeholder TXT record.
```
TXT('_dmarc', 'v=DMARC1; p=reject; rua=mailto:dmarc@satstack.cloud; fo=1')
```

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

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Mail Server: Deployment

Optional: sending authenticated mail

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