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Added instructions for setting up reverse DNS

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Dhruv Sharma 2020-06-23 01:09:49 +04:00 committed by GitHub
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README.md
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@ -49,10 +49,21 @@ actually works perfectly.
3. You need two little DNS records set on your domain registrar's site/DNS
server: (1) an **MX record** pointing to your own main domain/IP and (2) a
**CNAME record** for your `mail.` subdomain.
4. `apt purge` all your previous (failed) attempts to install and configure a
4. **A Reverse DNS entry for your site.** Go to your VPS settings and add an
entry for your IPV4 Reverse DNS that goes from your IP address to
`mail.<yourdomain.com>`. If you would like IPV6, you can do the same for
that. This has been tested on Vultr, and all decent VPS hosts will have
a section on their instance settings page to add a reverse DNS PTR entry.
You can use the 'Test Email Server' or ':smtp' tool on
[mxtoolbox](https://mxtoolbox.com/SuperTool.aspx) to test if you set up
a reverse DNS correctly. This step is not required for everyone, but some
big email services like gmail will stop emails coming from mail servers
with no/invalid rDNS lookups. This means your email will fail to even
make it to the receipients spam folder; it will never make it to them.
5. `apt purge` all your previous (failed) attempts to install and configure a
mailserver. Get rid of _all_ your system settings for Postfix, Dovecot,
OpenDKIM and everything else. This script builds off of a fresh install.
5. Some VPS providers block port 25 (used to send mail). You may need to
6. Some VPS providers block port 25 (used to send mail). You may need to
request that this port be opened to send mail successfully. Although I have
never had to do this on a Vultr VPS, others have had this issue so if you
cannot send, contact your VPS provider.