MXToolBox HTTP and HTTPS lookups fail with 403

What is the name of the domain?

What is the error number?


What is the error message?

The remote server returned an error: (403) Forbidden. (

What is the issue you’re encountering

errors are reported on mxtoolbox tests

What steps have you taken to resolve the issue?

Going to the website via http or https both work via the browser, but I’m guessing something is amiss if mxtoolbox is flagging it

What feature, service or problem is this related to?

DNS records

What are the steps to reproduce the issue?

Network Tools: DNS,IP,Email and then type in and do the http or https tests

Your site is working ok…
(You seem to have disabled IPv6).

Likely the MX toolbox checks are being blocked by bot detection or some other rule in your Cloudflare settings. You can see why any request is blocked by looking up in your security event log here…


Thank you!

I temporarily turned off the Fight Bot mode and the MXToolBox tests passed ok.

I also reenabled the IP6 setting, I’m not sure why that was off.

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