What is DMARC, and how to set it up without breaking your mail
DMARC is not a third authentication check — it is the rule that SPF or DKIM must align with the address your recipient actually sees.
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Email list cleaning: what verification catches, and what it cannot
Verification removes the addresses that would bounce — but no verifier can resolve a catch-all domain, and on B2B lists that bucket is large.
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Email deliverability test: what it measures, and what it cannot
An inbox placement test is the only one that measures placement — and even that has limits worth understanding before you act on the number.