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

An Omnisend email preview should show the campaign after it leaves the editor. MailSlurp receives the actual Omnisend 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 an Omnisend 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 Omnisend, open the campaign editor and choose Preview & test > Send test email.
5. Enter the render address and choose Send.
6. Return to MailSlurp and wait until every selected target is Ready.
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.

Before you begin

Prepare the final Omnisend campaign and a segment used only for the controlled MailSlurp test addresses.

Finish the campaign before testing. If the email uses personalization, select a representative profile or contact so fallback content, conditional sections, and merge fields can be reviewed in the delivered message.

How the Omnisend test path works

Omnisend exposes the test action from the campaign editor after the sender, subject, preheader, and design are saved. Check those settings before opening the modal because MailSlurp renders the delivered campaign revision, not the editor's unsaved state.

See the Omnisend campaign documentation 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 Omnisend 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.

Check the sender, subject, preheader, links, and footer before opening the test dialog. The render should be generated from the same saved campaign revision customers would receive.

Step 3: Send the Omnisend test email

In Omnisend, open the campaign editor and choose Preview & test > Send test email. Then enter the render address and choose Send. Use only the active MailSlurp render address for this device-preview run.

Wait for Omnisend 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 Omnisend message starts the render automatically. Open the result and wait until every required target displays Ready.

If a target reports a temporary capture failure, use its retry action and keep the completed captures. Approve the run only when the required target set is clean.

Step 5: Inspect the delivered renders

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 Omnisend campaign and send the revised message to a new MailSlurp render run so the approval evidence clearly belongs to the latest version.

Omnisend email preview checklist

• The latest saved Omnisend revision was sent.
• The final sender, subject, and preview text were used.
• Representative personalization data was applied.
• Every priority web, desktop, mobile, and dark-mode target is Ready.
• 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 Omnisend accepted the send, and make sure the address was not shortened or changed.

Personalization is blank

Update the test profile or contact values in Omnisend, preview the assembled content again, 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 an Omnisend email in Gmail and Outlook?

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

Can I preview Omnisend 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 Omnisend 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 Omnisend inbox placement and spam score guide to measure where the campaign lands.