IntoDNS runs an analysis on multiple aspects of your DNS, and tells you what isn't working.
https://intodns.com
MXToolbox will help you get your email records (SPF, DMARC and DKIM) straightened out, and offers a free weekly summary of your mail DNS health.
https://mxtoolbox.com
Google Postmaster tools can help you troubleshoot issues with sending mail to Google.
https://www.gmail.com/postmaster/
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