https://www.wordfence.com/threat-intel/vulnerabilities/id/bb7d99a7-1e7d-43e1-839c-286b454c8276?source=cve
https://plugins.svn.wordpress.org/wp-sendgrid-mailer/tags/1.4/wp-sendgrid-mailer.php
https://plugins.trac.wordpress.org/browser/wp-sendgrid-mailer/trunk/wp-sendgrid-mailer.php#L167
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