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Sendgrid is a web site mailing service that allows a site to send mail while separating website email from regular email.
CloudFlare is a layer between your site and the Internet.
Email delivery is important for businesses and testing that delivery from your site ensures that no hidden issues are present.
A site is doing a redirect and the redirect is back to the same URL - it self. There are a few reasons why this may happen from Wordpress, web server configs to any rewrites in place and at times CloudFlare.