User these to remove your domain from a blacklist or two or ...
MX Toolbox Email Health Check.
Get a free Google Postmaster Tools account to get insight into deliverability and reputation problems.
Sign up for a free Microsoft SNDS account to do the same.
Here's a whole guide on how to prevent your messages from getting blocked by Google.
Get your reverse DNS, SPF and DKIM records straightened out.
Get help creating records with MX Toolbox DMARC record and SPF record generators
An Open Source project that makes it easy to setup DKIM on Exchange. Instructions.
Testing your email setup
Send an email to your GMail account, then select 'Show Original' and Google shows a summary at the top with the status of your SPF,DMARC and DKIM config.
or
Go to https://www.mail-tester.com/ and send an email to the unique address generated, and get an analysis back of your server.
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