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docs: mention rDNS in the setup tutorial #833

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5 changes: 5 additions & 0 deletions docs/tutorials/setting-up.md
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Expand Up @@ -103,6 +103,11 @@ one as "primary". Add all other domains to the `local_domains` line:
$(local_domains) = $(primary_domain) example.com other.example.com
```
Do not forget to set a suitable rDNS (PTR) record for your server's IP address
to reduce the chances of outgoing mails getting marked as spam or being
downright rejected. Ideally, the PTR record should match whatever you specified
in `$(hostname)`.
## TLS certificates
One thing that can't be automatically configured is TLS certs. If you already
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