Simple tip if you send emails:
Get a unique IP and get your SPF, DMARC, etc set up.
IP check for reputation: https://talosintelligence.com/reputation_center/lookup?search=
https://www.mail-tester.com/ is great.
SPF analyzer: https://quickemailverification.com/tools/spf-analyzer
And what we did for DMARC:
You do not have a DMARC record, please add a TXT record to your domain _dmarc.examine.com with the following value:
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