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Whether inbound mail is routed to the correct mail server.
SPF (TXT)
Which servers are authorized to send mail on your behalf.
DMARC
Policy and reporting against spoofing and phishing.
DKIM
Digital signature records that verify email integrity.
SSL/TLS Support
Whether the mail server supports encrypted connections via STARTTLS and SMTPS.
SSL Certificate Expiry
Mail server certificate validity and remaining days.
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