# `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.

- Weight: +5
- Dataset: local-part-analysis
- Read from: `is_alias`
- Verdict reasons it comes with: none — a score-only signal

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.

```json
{
    "email": "mia+promo@acme.com",
    "normalized_email": "mia@acme.com",
    "deliverable": "deliverable",
    "is_alias": true,
    "risk_signals": [
        {
            "signal": "alias",
            "weight": 5,
            "dataset": "local-part-analysis"
        }
    ]
}
```

Reference: https://spaw.co/docs/signals/alias