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| -rw-r--r-- | README.md | 15 |
1 files changed, 13 insertions, 2 deletions
@@ -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. |