The MailVex guide

MailVex has two independent pieces: a Chrome extension that exports your Shopify Email campaigns from your own browser, and this dashboard, where you upload that export to analyze it and, on a paid plan, generate new email drafts.

The usual path is:

1. Install the extension and export your campaigns from Shopify Email (next section).
2. Upload the exported file here, in Import.
3. Read your campaigns in Analyze.
4. On a paid plan, write new emails in Create, using your AI credits.

None of this needs your Shopify password or admin access: the extension runs with your own, already logged-in session, in your own browser.

Install it from the Chrome Web Store — the "Add to Chrome — free" button on this site links straight to the listing.

Once installed:

1. Open your store's Shopify Email screen (Marketing → Email), already signed in as usual.
2. Click the MailVex icon in your browser toolbar. A side panel opens over Shopify Email.
3. Choose whether to export everything or only new emails since your last export, and whether to include each email's full HTML.
4. Click Export and wait. Shopify doesn't publish how long this takes — for a store with a long history it can take several minutes; you can keep using your computer for other things while it runs.
5. When it finishes, save the JSON file it downloads. That's the file you upload in the next step.

The extension talks to an internal Shopify Email endpoint that isn't officially documented by Shopify: if Shopify changes it, exporting can stop working until MailVex is updated. You'll see a clear error if that happens, never an invented number.

Emails

1. Install the MailVex extension in Chrome.
2. Open Shopify Email and click Export (see the previous section).
3. Wait for it to finish — you can keep working on other things meanwhile.
4. Upload the JSON file here, dragging it onto the drop zone or choosing it with the button.

Uploading the same file twice is safe: MailVex matches each email by its own id, so a repeated file just reports nothing new instead of duplicating anything.

What leaves your browser: only the content of the file you choose to upload. The export itself runs entirely inside the extension, against your own Shopify session, and nothing is sent anywhere until you upload a file here.

How often to export: there's no fixed schedule — export whenever you want your dashboard to catch up with your latest campaigns. Incremental export (new emails only) keeps this quick after the first full export.

If an email is rejected, it's for one of these reasons: it had no id, it repeated an id already used earlier in the same file, or its metrics or landing-page data wasn't in the shape MailVex expects. The rest of the file still imports normally — one rejected email never blocks the others.

Catalog

Export your catalog from Shopify (Admin → Products → Export) as a CSV. MailVex reads it by column name, so column order doesn't matter, but every row needs at least a Handle and a Title; description, type, tags, status and price are optional. The file is capped at 10 MB and 5,000 products — above either limit it's rejected whole, never partially. Uploading a new catalog replaces the previous one entirely.

MailVex never shows a rate or a ranking it can't support with real data — when something can't be calculated, you'll see a dash, never an invented zero.

"Per 1,000"

Sales and some other totals are shown as a rate per 1,000 delivered emails (sales ÷ delivered × 1,000) instead of a raw total. A rate isolates performance from volume: sending fewer emails lowers a raw total on its own, without meaning performance dropped.

"Maturing"

An email sent in the last 30 days is still "maturing". It's excluded from rankings and period-over-period comparisons, because an email that just went out hasn't had time to accumulate the opens, clicks or sales it eventually will — comparing it against older emails would be unfair to both.

How sales are attributed

The sales figure is Shopify's own attribution model (last non-direct click), not an independent audit by AutomatLabs. It counts an order when someone clicked a link in the email and bought afterward; it doesn't count someone who saw the email but never clicked, and it isn't guaranteed to match the revenue total in your Shopify balance, since Shopify's own reporting can use other attribution rules elsewhere. Treat it as a signal of which campaigns are driving purchases, not as a bookkeeping figure.

Click ranking

Emails are ranked by a statistical lower bound (the Wilson interval) on their click rate, not the raw rate — with few recipients, a raw rate can look great by pure chance. The raw rate is still shown next to it.

Best and worst emails (Pro plan)

This list doesn't rank by click alone: an email with real sales always ranks above one with no sales, whatever its click or open rate. Within each group (with sales or without), the score mostly weighs sales adjusted for send volume, with a smaller share from the click ranking (Wilson interval) and the open rate. That way, the email that sold the most never gets hidden behind one with good clicks but no sales at all.

"Burned the list" and "suspicious clicks"

These flags compare an email against others of the same type sent in the same quarter. "Burned the list" flags unusually high unsubscribes or complaints relative to that group; "suspicious clicks" flags clicks that exceed opens, or a click rate far above what the group normally sees. Both need a handful of comparable emails before MailVex will show them at all.

Create writes an email draft using your store's own "voice": a profile MailVex builds from the emails and examples you've already imported, plus whatever you pick to guide a specific draft. You review and edit every draft yourself — MailVex never sends anything on your behalf.

Generating a draft uses more AI credits than regenerating a single piece of an already-generated draft — each action has its own cost. Your plan shows how many you've used, how many are left, and when your allowance renews (the 1st of each month) — the free and extension-only plans don't carry any. Nothing is generated if you're out of credits or if your store hasn't imported enough to build a voice profile from yet; MailVex tells you which of the two is missing rather than failing silently.

An import rejects some emails. See "Import emails and catalog" above: a missing or repeated id, or an unexpected shape, rejects only that email, never the whole file.

A catalog CSV fails to import. Check it has a Handle and a Title column, and that it's under 10 MB and 5,000 products; the error message names the exact problem found.

I changed the store's time zone and the numbers in Analyze moved. That's expected: changing the time zone only changes which calendar day, week or month each already-imported email falls into, so Analyze recalculates its hour-of-day, day-of-week and period groupings for the new zone — no new data is fetched and no AI is involved.

"Create from a link" is missing a field. It needs your store's domain configured in Stores first; without a domain, MailVex can't build a product link, so that field stays hidden until you add one.

A paid plan shows "X of Y stores". That's your plan's limit, not a bug: the free and single-store plans allow 1 store, Pro allows up to 3.