Also just as a reminder, I strongly recommend anyone configuring email in Discourse to send a test email. You can do this from the admin panel, under Email logs, at the top where the button says “send test email”.
This email contains crucial, extremely important tips to get your Discourse forum email notifications working:
This is a test email sent from your Discourse forum at:
Email deliverability is complicated. Here are a few important things you should check first:
Know how to view the raw source of the email in your mail client, so you can examine the email headers for important clues. in Gmail, it is the “show original” option in the drop-down menu on each mail.
IMPORTANT: Does your ISP have a reverse DNS record entered to associate the domain names and IP addresses you send mail from? Test your Reverse PTR record here. If your ISP does not enter the proper reverse DNS pointer record, it’s very unlikely any of your email will be delivered.
Is your domain’s SPF record correct? You can test your SPF record here.
Check to make sure the IPs of your mail server are not on any email blacklists.
Verify that your email server is definitely sending a fully-qualified hostname that resolves in DNS in its HELO message. If not, this will cause your email to be rejected by many mail services.
Configure DKIM email key signing in your email software, and place the public DKIM key in your DNS records. This is not required, but will significantly improve email deliverability.
We hope you received this email deliverability test OK!
Good luck,
Your friends at Discourse