A medical billing company's cold-email campaign damaged its domain reputation so badly that ordinary one-to-one client emails vanished into spam. Untangling it took sixty days of mail logs, a five-test placement study, and a signature that was secretly impersonating a phishing attack — while revealing an active impersonation campaign nobody knew was running.
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A flooring company's outbound email started bouncing because a neighbor on their shared hosting IP had poisoned the well. Quotes were missing customers and the team had run out of patience — the only real fix was to leave.
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A nonprofit organization was sending nearly two million emails a year — and Gmail was punishing them for it. The fix wasn't technical. It was figuring out which 'engaged' contacts were ghosts.
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WordPress security audit case study exposing public backup files, form misrouting, and suspicious logins. Learn remediation and hardening priorities.
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cloud-sec-av.com is a legitimate domain used by Check Point Harmony Email Security (formerly Avanan). It appears in DMARC reports when Check Point scans incoming email for threats.
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SPF and DMARC case study: a partial SPF fix triggered authentication failures. Learn accurate attribution, alignment, and durable email policy design.
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Email authentication case study: hidden gateway broke DKIM and DMARC alignment. Learn how root-cause analysis fixed deliverability and trust.
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