Hey @xarnoldxs,
This is an error that is occurring when your server is trying to send email. It is the result of a change to how PHP 5.6 handles PHPMailer encryption validation.
I realize that’s a bunch of gobblygook that probably means even less to you than it does to me.
I can see two resolutions:
1) Disable error display — this is a PHP warning which means the mail will still be sent but you’re being warned of a potential (in this case security verification) issue. The message won’t display and you can carry on in bliss. This isn’t a good solution but it is a solution. You can see how to disable the WP error reporting here: https://codex.wordpress.org/Debugging_in_WordPress — disable WP_DEBUG or WP_DEBUG_DISPLAY to get the message to stop showing
2) Contact your host and ask them for assistance in reconfiguring your php.ini or fixing the certificate that isn’t being verified. This is the correct and best solution but it means you need to work with your server’s customer support. Some folks hate that (I do) and will avoid it at all costs but it’s the best answer here.
Sorry I can’t be more helpful,
