How to Preview Mailjet Emails in Gmail, Outlook, iPhone, and Android

A Mailjet email preview should show the campaign after it leaves the editor. MailSlurp receives the actual Mailjet test email and renders that delivered message across Gmail, Outlook, Apple Mail, Yahoo, iPhone, iPad, Android, and desktop clients. This gives campaign reviewers concrete evidence for responsive layout, image loading, buttons, typography, footers, and dark mode before launch.

Quick answer

To test a Mailjet email across clients and devices:

1. Open Device Previews in MailSlurp and create a render.
2. Select the Gmail, Outlook, Apple Mail, iPhone, Android, and dark-mode targets that matter to your audience.
3. Copy the complete MailSlurp render address.
4. In Mailjet, open the finished campaign and choose Preview & Test > Send a test email.
5. Add the render address, press Enter, and choose Send.
6. Return to MailSlurp and review the completed screenshots. Wait for every required target to show Ready before approval.
7. Compare the screenshots and correct the campaign before launch.

Use the final sender, subject, preview text, body, images, links, personalization, footer, and unsubscribe content for the run.

Which Mailjet preview should you use?

Mailjet's responsive editor preview helps you check desktop and mobile widths. Its separate Email Preview feature offers selected inbox/client previews. The two checks are different; changing the editor width is not the same as opening the email in Gmail or Outlook.

With MailSlurp, send the actual Mailjet test email to a render address and review the message that arrived. You can compare client screenshots, comment on a visual problem and check a corrected version without moving the campaign out of Mailjet.

Before you begin

Use a validated Mailjet sender, a finished campaign, a MailSlurp account and controlled test recipients. Keep any test contact list separate from customer audiences.

Finish the campaign before testing. If the email uses personalization, prepare representative contact values and check the fallback for missing data. Mailjet's personalization guide explains contact properties and the Default value field. Inspect what the test actually contains before treating it as evidence for a personalized campaign.

How the Mailjet test path works

Mailjet keeps test delivery inside the campaign's Preview & Test dialog. Pressing Enter after the render address turns the typed value into a recipient token; check that token before choosing Send so the message is not left as uncommitted text.

See the Mailjet campaign quick start for the provider's current account and campaign requirements.

Step 1: Create a MailSlurp device preview

Open Device Previews and create a new render. Select a target set that represents your audience. A practical release check includes Gmail web and dark mode, Outlook.com, New Outlook, Outlook Classic, Apple Mail, iOS Mail, Gmail iOS, Gmail Android, Outlook iOS, Outlook Android, and Yahoo.

Copy the complete address from the active run. The address encodes the selected targets, so do not shorten it or reuse an address shown in a tutorial screenshot.

Step 2: Prepare the final Mailjet message

Open the campaign you intend to send. Confirm the visible From identity, reply handling, subject, preview text, images, links, personalization, footer, physical address, and unsubscribe content.

Use the same validated sender and complete campaign content you plan to launch. Mailjet's test send assembles the campaign and delivers it to the address in the test dialog.

Step 3: Send the Mailjet test email

In Mailjet, open the finished campaign and choose Preview & Test > Send a test email. Then add the render address, press Enter, and choose Send. Use only the active MailSlurp render address for this device-preview run.

Wait for Mailjet to confirm that the test was accepted. Do not close the campaign until the saved content and recipient are correct.

Step 4: Wait for every client to finish

Return to MailSlurp. Receiving the Mailjet message starts the render automatically. Open the result and wait until every required target displays Ready. You can begin reviewing completed screenshots while other targets are still Capturing, but keep pending or failed targets unresolved.

This saved Mailjet run shows 14 ready captures and 1 still capturing. The green annotation says there are no failed clients at that moment; it does not mean the remaining client has passed review. You can inspect the ready results while it finishes.

If a target reports a temporary capture failure, use its retry action and keep the completed captures. Wait for every required target, then review its appearance before approving the campaign. Ready means a screenshot is available, not that the design is correct.

Step 5: Inspect the delivered renders

In the example above, Outlook iOS breaks the word "Spend" across two lines, while the visible desktop captures keep it together. That is a concrete issue to take back to the Mailjet editor: review the headline size and available content width, then test the revised campaign. The screenshot alone does not identify the exact HTML or CSS cause.

Open the highest-risk screenshots at full size and compare clients when needed. Check:

• headline wrapping, body width, and reading order
• mobile stacking and horizontal overflow
• hosted image loading, cropping, dimensions, and alternative text
• button contrast, width, spacing, and tap area
• font fallbacks and line-height changes
• Outlook Classic spacing and table alignment
• light- and dark-mode contrast
• footer, physical address, unsubscribe, and preference links

If one client breaks, correct the Mailjet campaign and send the revised message to a new MailSlurp render run so the approval evidence clearly belongs to the latest version. Compare the same target across the two runs; use the team review workflow to keep comments and the final decision together. For other narrow-screen problems, follow the iPhone and Android email testing guide.

Mailjet email preview checklist

• The latest saved Mailjet revision was sent.
• The final sender, subject, and preview text were used.
• Representative personalization data was applied.
• Every required web, desktop, mobile, and dark-mode target is Ready and has been reviewed; pending or failed targets remain unresolved.
• Images load and scale without clipping.
• Buttons remain readable and easy to tap.
• Outlook Classic preserves the intended hierarchy.
• Footer and unsubscribe content are visible.
• The run was repeated after the last material edit.

Troubleshooting

MailSlurp does not detect the email

Copy the active render address again, confirm Mailjet accepted the send, and make sure the address was not shortened or changed.

Personalization is blank

Check the contact property used by the message and its default value in Mailjet. Verify which values appeared in the delivered test before reviewing that version. If a required personalized branch is still empty, resolve it in the campaign and send a fresh test.

An image is missing in one client

Use absolute public HTTPS image URLs, set useful dimensions and alt text, compare the failing client with another completed render, and retest the corrected campaign.

Outlook spacing differs from Gmail

Outlook Classic uses a different rendering engine from many web and mobile clients. Use email-safe table structure where needed, set explicit image dimensions, and rerun each correction.

FAQ

How do I preview a Mailjet email in Gmail and Outlook?

Create a MailSlurp device preview, copy its render address, and send the final Mailjet test email to that address. MailSlurp captures the delivered message in the selected Gmail and Outlook targets.

Can I preview Mailjet emails on iPhone and Android?

Yes. Include iOS Mail, Gmail iOS, Outlook iOS, Gmail Android, and Outlook Android in the MailSlurp target set.

Does the Mailjet editor preview replace email client testing?

The editor is useful while composing. MailSlurp adds client-specific screenshots of the delivered message so reviewers can see rendering differences outside the editor canvas.

When should I rerun the preview?

Rerun after changing copy, contact data, images, links, layout, sender details, footer content, or campaign settings. Approve only the latest delivered version.

After visual approval, continue with the Mailjet inbox placement testing guide to measure where the Mailjet campaign lands.