Hi, I have just got new problem with user registration. Users create account on front-end or admin creates account from back-end all ends up with the same error Gateway Timeout
Gateway Timeout
The gateway did not receive a timely response from the upstream server or application.
The account creation was successful, however, because of the message users didn't know they did it successfully so we had lost of requests to recheck their accounts.
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Well It could be possibly the mail server smtp which might be halting the server and php is waiting for this process ,using external mail services like mailchimp might help in such a issue but still we are not confirmed .
To confirm the issue please try your gmail account as smtp using this plugin https://wplms.io/support/knowledge-base/postman-smtp-for-emails/