# _hsmi — HubSpot's email message ID

- Canonical: https://linkclean.app/trackers/hsmi/
- Updated: 2026-07-20
- Author: Ken Tominaga (https://ken0nek.com)
- Get the app: https://apps.apple.com/us/app/linkclean/id6758604043

Parameter: `_hsmi` · Category: Email marketing · Vendor: HubSpot

> _hsmi is **HubSpot's email message identifier** — names the specific email send the link came from. Less sensitive than _hsenc (campaign-level vs per-recipient), but always paired with it on HubSpot links.

## Why _hsmi exists separately

HubSpot's tracking pipeline distinguishes “which campaign” (close to utm_campaign in risk profile) from “which contact” (per-person, identity-bound). _hsmi covers the campaign side; _hsenc covers the per-contact side. The two-token design mirrors Mailchimp's mc_cid / mc_eid split.

_hsmi alone tells HubSpot's analytics how a specific email send is performing. It rarely appears without _hsenc — but the two are conceptually distinct.

## How LinkClean removes it

Default-on. Same path as _hsenc, mc_cid, mkt_tok.

## Example

Looks like this in a URL: `https://example.com/article?_hsenc=p2ANqtz-_aBcDeF&_hsmi=89123456`

After LinkClean: `https://example.com/article`

## Frequently asked

**Is _hsmi sensitive on its own?**

Less than _hsenc. _hsmi names the campaign-send (like utm_campaign); _hsenc names the recipient. Strip both.

**Do all HubSpot emails have _hsmi?**

Effectively yes — HubSpot's outbound-email tracking enables it by default for any tracked send.


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