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(I am a Japanese who is not good at English. I’m writing this question with machine translation, so please ask me if you have any difficulty reading it.)
I am using a WordPress server and a proxy server.
When I sent a test email using wp mail smtp plugin and SendGrid, I got the following error message.
Domain check result
cURL error 56: Received HTTP code 403 from proxy after CONNECT
Probably, the reason is that the domain of the API to check the domain is not registered in the proxy server.
What kind of domain name should I register with the proxy?
You can also use wildcards to register domain.
