Gmail, Yahoo and Outlook sender requirements: what you need
Gmail, Yahoo and Outlook.com now require SPF, DKIM and DMARC from bulk senders, and reject mail that falls short. The rules side by side, and what to do.
Read postMTA-STS and TLS-RPT explained: encrypting the mail sent to you
DMARC protects who can send as you. MTA-STS protects mail on its way to you. What MTA-STS and TLS-RPT do, and how to roll them out without losing mail.
Read postHow email spoofing works, and how DMARC stops it
Why plain email lets anyone forge your From address, the real damage spoofing does to a business, and how a DMARC policy shuts it down at the receiver.
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