53 lines
2.2 KiB
Markdown
53 lines
2.2 KiB
Markdown
# Mail Server: Deployment
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1. Create MX and TXT records. For example, here are example records defined in dnscontrol:
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```Javascript
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D('example.com', REG_NAMECHEAP, DnsProvider(DSP_NAMECHEAP),
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A('mail', '10.87.129.99'),
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MX('@', 10, 'mail.example.com.'),
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TXT('_dmarc', 'v=DMARC1; p=none'),
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TXT('@', 'v=spf1 mx ~all')
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);
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```
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The `A` and `MX` records are required, while the `TXT` records are optional but recommended.
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2. Configure your playbook's variables and run this playbook.
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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:
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```shell
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sudo echo hello@example.com:$(doveadm pw -s BLF-CRYPT):$(id -u maildir):$(id -g maildir) >> /etc/dovecot/imap.passwd
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```
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Also, if you use `doas` rather than `sudo`, you need to permit your ansible_user to become opendkim in your `/etc/doas.conf`:
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```
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permit nopass blee as opendkim
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```
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4. configure some virtual aliases in /etc/postfix/virtual and run: `postmap virtual` (See `man 5 postconf` for details)
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Validate your dns records: [mxtoolbox.com](https://mxtoolbox.com/)
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## Optional: sending authenticated mail
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* Create another TXT record for DKIM using the contents of /etc/dkimkeys/mail.txt
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Here's an example line in dnscontrol:
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```Javascript
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TXT('mail._domainkey', 'v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANB...QIDAQAB')
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```
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* See [print-rdata.py](examples/print-rdata.py) for a (kind of bad) example of how to automatically parse mail.txt
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* 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)
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* If you're really feeling adventurous, you could even set up a proper dmarc address to replace the original placeholder TXT record.
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```Javascript
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TXT('_dmarc', 'v=DMARC1; p=reject; rua=mailto:dmarc@satstack.cloud; fo=1')
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```
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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).
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