Unwrap a rewritten link
The gateway rewrote every link through its click-checker. Decode the base64 parameter to see the real destination, without clicking, and count how many people received it.
Briefing
Link protection services replace URLs in mail with their own, carrying the original as a parameter, so they can check it at click time. That also hides the real destination from anyone reading the message.
This gateway encodes the original URL in the u= parameter with base64. cut and base64 -d undo it.
mail-triage · Email and phishing
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