Email: Settings, Preview and Test
Configure sender details, design options, unsubscribe settings, analytics, and test your email before sending.
The Settings, Preview, and Test functions are all accessible from the bottom bar of the email editor. This is where you configure sender details, design options, unsubscribe settings, analytics tracking, and where you preview and test your email before sending.
In this article
Settings: Email tab
Click Settings in the bottom bar. The first tab is Email — this is where you configure sender details and the subject line.
Field | What it does | Tips |
Email name | Internal name — visible on the start page and Calendar. Not seen by recipients. | Use descriptive names for easy searching later. |
Sender name | The "from" name recipients see in their inbox. | Use your brand name or "Name at Brand". Be consistent across sends. |
Sender email | The "from" email address. | Use a DKIM-authenticated domain. See Email Authentication. |
Reply-to email | Where replies go if a recipient replies to the email. | Use a monitored mailbox — recipients do reply to marketing emails. |
Subject line | The headline in the inbox. Recommended: 40–50 characters. | Type |
Preheader | Preview text after the subject line. Recommended: 85–100 characters. | Complement, don't repeat, the subject line. Supports Data tags. |
Language | Sets the content language for accessibility — screen readers use this to pronounce text correctly. | Always set this. Required by the European Accessibility Act. |
Do not track email openings | Disables the tracking pixel for this email. The report will show 0 opens. | Use for transactional or internal emails where open tracking isn't needed. |
Settings: Design tab
Setting | What it controls | Recommended |
Email width | The width of the email body in pixels. | 600px — optimal for most email clients. Max: 800px, Min: 320px. |
Top padding | Space between the top of the email client window and the email content. | 10–20px provides a comfortable visual cushion. |
Body colour | Background colour of the email content area. | Use your brand's primary background colour. Set via hex, RGB, or colour picker. |
Background colour | Background colour behind the email body (the outer area visible in desktop clients). | A neutral or brand-complementary colour. |
Background image | Upload an image for the email background. Options: Tile (repeats), Fill, Fit, Stretch. | ⚠️ Fill, Fit, and Stretch do not work in Outlook (Windows) — the fallback background colour is shown instead. Tile works everywhere. |
Border | Border around the email body. Set width (px) and corner radius. | Optional — adds visual framing. |
The colour picker saves your 16 most recently used colours per email (not across emails).
Settings: Unsubscribe tab
Configure the landing page that appears when a Profile clicks the unsubscribe link:
Setting | What it does |
Confirmation type | Message — shows a confirmation message on screen. Redirect link — redirects to a URL of your choice.
|
Message text | The opt-out confirmation text displayed after the Profile confirms. |
Logo | Upload a logo for the unsubscribe page. Recommended: 100×100px. |
Logo text | Text displayed alongside the logo. |
Background colour | Background colour of the unsubscribe page. Match your brand. |
💡 Tip: Save in your Template
Unsubscribe settings are saved with Templates. Configure them once in your main Template and they apply to every email created from it.
Read more: Unsubscribe
Settings: Analytics tab
UTM parameters let you track how email traffic arrives at your website. When a recipient clicks a link in your email, the UTM parameters are appended to the URL — and your analytics tool (Google Analytics, Matomo, or similar) uses them to attribute the visit to your email campaign. Read more: Google Analytics and UTM tracking
Add UTM parameters to track email traffic in Google Analytics. These are applied to all tracked links in the email.
Available parameters (fields marked * are mandatory when UTM is enabled):
utm_source* — identifies the traffic source (e.g. "apsis_one")
utm_medium* — identifies the marketing medium (e.g. "email")
utm_campaign* — identifies the campaign (e.g. "spring_sale_2026")
utm_term — optional keyword/term
utm_content — optional content variant (useful for A/B tests)
You can include Data tags (##) in UTM values for dynamic personalisation.
⚠️ Note
UTM settings configured here apply globally to all links in this email. You can override them on individual links via Link settings. Also note: UTM/Analytics settings are not saved when a Row is saved as an Asset. Read more: Google Analytics and UTM tracking
Settings: Custom parameters tab
Create your own tracking parameters (similar to UTM but with custom names). Custom parameters are appended to the links in your email and can be used to track visitors in your own analytics system.
Save as Template
Click Save as template in the bottom bar to save the current email as a Template. Enter a name and description — the Template saves all content, layout, design settings, sender details, and unsubscribe configuration.
Note: Row Segmentation and A/B test version assignments are not saved with the Template. Read more: Email Templates
Preview
Click Preview in the bottom bar to see how your email looks before sending.
View | What it shows |
Desktop | How the email renders on a desktop email client. |
Mobile | How the email looks on a mobile screen, including column stacking behaviour. |
Text | The plain-text version of the email — essential for accessibility and deliverability. |
Use View segments to toggle between different Row Segmentation versions and verify each variant looks correct.
Email client test
Click Email client test in the bottom bar to see how your email renders across specific email clients — including Outlook (Windows), Gmail, Apple Mail, and others. This uses a rendering service to show screenshots of your email in each client.
This is especially useful for catching Outlook rendering issues (background images, column layouts, button styling) before your email goes live.
1. Click Email Client test in the bottom bar.
2. If you haven't used Litmus before, click Run new test in the Getting started pop-up.
3. Sign up for a Litmus account or sign in to an existing one.
4. You will see all the email clients available, with a preview of how your email would be displayed.
5. Click on an email client to take a closer look. Try Comparison to compare to other email client and Detail view in the top right corner.
Test send
Click Test in the bottom bar to send a test email to any email address.
Enter the email address you want to send the test to.
If your email has Row Segmentation, select which Segment version to include in the test.
Click Send test.
💡 Tips for test emails
Test emails may land in your spam or junk folder — this is normal for test sends and not an indication that your live send will have the same issue. Always open the test email and check: all links work, images load, Data tags render correctly (or check if empty), layout looks correct on both desktop and mobile, and the unsubscribe link takes you to the correct landing page.
⚠️ Data tags in test emails
Test emails are sent to the address you enter — if that address doesn't exist as a Profile with the relevant Attributes populated, Data tags will appear as blank or show the raw tag. Use the Preview to verify Data tags instead, or create a test Profile with complete data.
Troubleshooting
Issue | Cause and solution |
"My background image doesn't show in Outlook" | Outlook (Windows) doesn't support Fill, Fit, or Stretch background images. Use Tile (which works everywhere) or accept that the fallback background colour will be shown in Outlook. |
"My test email landed in spam" | Test emails often trigger spam filters because they bypass normal sending patterns. This doesn't predict live send behaviour. Move it out of spam to see the full content with images loaded. |
"My Data tags show blank in the test email" | The test recipient address may not exist as a Profile with populated Attributes. Create the profile with the email you want to test to, and add TAGs and attributes to the profile before testing again. |
"My recently used colours aren't showing" | The colour picker saves up to 16 recently used colours per email — not across emails. Starting a new email resets the colour history. |
"My email looks wider than expected" | Check the Email width in Settings → Design tab. The default is 600px. If set higher, the email may not fit standard email client windows. Max is 800px. |
What's next?
Google Analytics and UTM tracking — Detailed guide on UTM parameter setup.
Unsubscribe — How opt-out works and how to customise the landing page.
Link settings — All link types, tracking, and personalisation options.
Email – Best Practice — Design, content, and deliverability tips.