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Why your cold emails land in spam
It's almost never your subject line. It's usually one of these.
Missing or broken SPF/DKIM/DMARC
Auth failures = instant spam folder.
Cold domain, no warm-up
Brand-new domains get sandboxed for 4–6 weeks.
High bounce rate
Over 5% and providers throttle you fast.
Spam-trigger words
Free, guarantee, click here — minor signals, not the main issue.
Bad list quality
Catch-all + stale data = spam-trap hits.
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