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alias

The address carries a plus-tag

mia+promo@ is the same inbox as mia@ under a disposable label — a favourite of signup-bonus farmers, and the reason to dedupe on normalized_email.

risk weight
+5
dataset
local-part-analysis
reads from
is_alias
verdict reason
none: a score-only signal

What it means

is_alias reads the plus-tag; normalized_email strips it and folds Gmail dots, so tagged variants of one mailbox share one suppression entry and one repeat marker.

It comes with no verdict reason.

What to do

Dedupe on normalized_email and read the tag as a hint, not a fault.

Example response 

{
    "email": "[email protected]",
    "normalized_email": "[email protected]",
    "deliverable": "deliverable",
    "is_alias": true,
    "risk_signals": [
        {
            "signal": "alias",
            "weight": 5,
            "dataset": "local-part-analysis"
        }
    ]
}

Abbreviated: a real answer carries all 46 fields, listed in the verify-email reference. The risk_signals entry shown is the one this signal adds; the weights of every entry in the list sum to risk_score.

Related

markdown version: /docs/signals/alias.md