Your could debug php mailer in WP using franz’s wpmail_exceptions plugin https://gist.github.com/franz-josef-kaiser/5840282
Place the first file in /wp-content/mu-plugins/ and make sure you’ve set WP_DEBUG to true. You should test while logged in as administrator. Errors will be printed in main buffer so make sure to inspect any xhr requests if your form works asynchronously (Ajax).
Good luck
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