port 25 note
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@ -46,12 +46,16 @@ actually works perfectly.
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2. **A Let's Encrypt SSL certificate for your site's `mail.` subdomain**.
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2. **A Let's Encrypt SSL certificate for your site's `mail.` subdomain**.
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Create a nginx/apache site at `mail.<yourdomain.com>` and get a certificate
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Create a nginx/apache site at `mail.<yourdomain.com>` and get a certificate
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for it with Let's Encrypt's [Certbot](https://certbot.eff.org/).
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for it with Let's Encrypt's [Certbot](https://certbot.eff.org/).
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3. - You need two little DNS records set on your domain registrar's site/DNS
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3. You need two little DNS records set on your domain registrar's site/DNS
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server: (1) an **MX record** pointing to your own main domain/IP and (2) a
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server: (1) an **MX record** pointing to your own main domain/IP and (2) a
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**CNAME record** for your `mail.` subdomain.
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**CNAME record** for your `mail.` subdomain.
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4. `apt purge` all your previous (failed) attempts to install and configure a
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4. `apt purge` all your previous (failed) attempts to install and configure a
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mailserver. Get rid of _all_ your system settings for Postfix, Dovecot,
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mailserver. Get rid of _all_ your system settings for Postfix, Dovecot,
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OpenDKIM and everything else. This script builds off of a fresh install.
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OpenDKIM and everything else. This script builds off of a fresh install.
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5. Some VPS providers block port 25 (used to send mail). You may need to
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request that this port be opened to send mail successfully. Although I have
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never had to do this on a Vultr VPS, others have had this issue so if you
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cannot send, contact your VPS provider.
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## Post-install requirement!
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## Post-install requirement!
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