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I installed this today and went through the entire setup just as described in your Gmail documentation. But after authorizing the plugin to send emails through my google account, although I got a message saying it was validates, right after I get this message:
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v1.4.2 logged this error during the last time it tried to send an email:
Mailer: Gmail
GuzzleHttp requires cURL, the allow_url_fopen ini setting, or a custom HTTP handler.
Consider running an email test after fixing it.
The button in the authorization field looks the same too, still asking to click the button to confirm authorization, although I already did.
When I did authorize it, I got a warning message and authorized the process through the advanced option, it might be related to do that.
What is causing this error and how should I solve it?