gmail says "best guess record for domain

I am using php to send emails from my droplet and the emails always go to the gmail spam folder.

Specifically, I see the following:

Received-SPF: pass ( best guess record for domain of designates as permitted sender) client-ip=; Authentication-Results:; spf=pass ( best guess record for domain of designates as permitted sender)

Something needs to be done in order to avoid having the emails go to the spam folder.

The message “best guess record for domain” indicates that something needs to be done with the subdomain “droplet”?

Do I have to define something in the DNS?


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Accepted Answer

It appears that you have an SPF record configured for, but not, which emails are being sent from. This is why you are seeing that message—Google is guessing that it should use your domain’s SPF record for the subdomain as well.

Consider using DKIM in order to try and improve deliverability rates. See this tutorial—it is a bit old, but the instructions should still work.

You can also use this tool to check your server’s settings and see if you can improve anything else: