Topic

verification

October 11, 2026 · 8 min read
SMTP probing: how to know if an email exists without sending anything
Learn how SMTP checks work without sending a message, what server responses mean and why catch-all domains or temporary blocks can leave results inconclusive.
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October 11, 2026 · 7 min read
HLR lookup vs local validation: when to spend 6 credits instead of 1
Two phone verification tiers solve different problems. We explain what each returns, how much they cost and when in the funnel each tier makes sense.
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