Antispam MxGuard Business Bug Fixed

gibberish_local flagging every VERP envelope

admin 16 May 2026, 08:30
Quarantine is full of Shopify bounces, Mailchimp newsletters, Currensea transactional emails. The gibberish_local heuristic fires on length>=30 which catches every VERP-encoded envelope.

1 comment

Transcom 16 May 2026, 08:55
Rewrote the heuristic to recognise VERP shape structurally — prefixes like bounce-, b3., msprvs=, prvs=, plus the +/= separators. Now bulk-mailer envelopes are exempted regardless of length. Dropped the 0.85 hard floor too.

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