cURL issue 35: SSL connect error
If sending is not working as expected and you see this error message displayed when checking your task scheduler connection, it means something is preventing your emails to be sent.
The cURL error 35 can appear when the cURL function cannot connect to your website using SSL.
Curl often uses a different set of certificates, shipped with PHP. There are several things that can cause this problem, in most cases updating both cURL and PHP to a newer version will resolve this issue.
If this doesn’t resolve the problem, please contact your web hosting company, as they can check why cURL is having issues.