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CSS Properties

min-height

CSS property · 18 supported, 0 partial, 3 unsupported across 21 clients

min-height is safe in 18 of 21 email clients as of Sep 2, 2026, the holdouts are Outlook (New), Outlook Classic, Proton Mail.

  • 6/7 webmail, 4/6 desktop, 8/8 mobile clients support min-height fully.
  • Unsupported in Outlook (New), Outlook Classic, Proton Mail.
  • Outlook Classic (Word engine, supported to at least 2029) does not fully support min-height, and its replacement changes little here; see the deprecation diff.
  • Documented before/after fixes on this page cover 21 clients, including Gmail and Gmail Android.
  • Across all clients, only 6 of 298 tracked HTML/CSS features render identically everywhere.

Source: caniemail.com (MIT), via the Emailens engine. Last tested upstream Nov 29, 2021, synced by Emailens Sep 2, 2026.

Client Support

ClientCategoryEngineSupport
GmailwebmailGmail WebSupported
Gmail AndroidmobileGmail MobileSupported
Gmail iOSmobileGmail MobileSupported
Outlook 365webmailOutlook WebSupported
Outlook (New)desktopOutlook WebUnsupported
Outlook ClassicdesktopMicrosoft WordUnsupported
Outlook iOSmobileOutlook MobileSupported
Outlook AndroidmobileOutlook MobileSupported
Outlook for MacdesktopWebKitSupported
Apple MaildesktopWebKitSupported
Apple Mail iOSmobileWebKitSupported
Yahoo MailwebmailYahooSupported
Yahoo Mail AndroidmobileYahooSupported
Yahoo Mail iOSmobileYahooSupported
Samsung MailmobileSamsungSupported
ThunderbirddesktopGeckoSupported
HEY MailwebmailWebKitSupported
Proton MailwebmailProtonUnsupported
AOL MailwebmailAOLSupported
FastmailwebmailFastmailSupported
SuperhumandesktopBlinkSupported

Client-by-client behaviour for min-height

Fully supports min-height (18): Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, AOL Mail, Fastmail, Superhuman.

No support (3): Outlook (New), Outlook Classic, Proton Mail. Plan fallbacks for these clients before relying on min-height in production sends.

Fixes & Workarounds

Outlook (New)

Unsupported

Outlook ignores min-height. Use a fixed height or a spacer image.

Before (Broken)

before.html
1 line 
<td style="min-height: 100px;">Content</td>

After (Fixed)

fixed.html
2 lines 
<!-- Outlook ignores min-height. Use height or a spacer image. -->
<td height="100" style="height: 100px;">Content</td>

Use a fixed height or spacer instead of min-height

Outlook Classic

Unsupported

Outlook ignores min-height. Use a fixed height or a spacer image.

Before (Broken)

before.html
1 line 
<td style="min-height: 100px;">Content</td>

After (Fixed)

fixed.html
2 lines 
<!-- Outlook ignores min-height. Use height or a spacer image. -->
<td height="100" style="height: 100px;">Content</td>

Use a fixed height or spacer instead of min-height

Proton Mail

Unsupported

Outlook ignores min-height. Use a fixed height or a spacer image.

Before (Broken)

before.html
1 line 
<td style="min-height: 100px;">Content</td>

After (Fixed)

fixed.html
2 lines 
<!-- Outlook ignores min-height. Use height or a spacer image. -->
<td height="100" style="height: 100px;">Content</td>

Use a fixed height or spacer instead of min-height

Production guidance for min-height

min-height is a CSS property. Across the email client matrix, 18 of 21 tracked clients support it fully, 0 only partially, and 3 not at all. The clients most likely to require a workaround for this feature are Outlook (New), Outlook Classic, Proton Mail. Each of them needs a tailored fallback. See the per-client examples above for the specific code fix Emailens recommends.

When in doubt, ship a baseline that renders without min-height and treat it as progressive enhancement on clients where support is verified. Emailens automatically detects cross-client divergence on this feature when you preview an email, so you can see exactly which template paths break before a campaign goes out.

Related Features

!important accent-color align-items animation aspect-ratio backdrop-filter background background-blend-mode

Check your own HTML for min-height

Paste your own, or run the sample below. Analyzed in this page, with no signup and nothing stored.
Zero-Friction Engine Preview

Test your min-height layout across 21 email clients

Preview rendering, catch CSS issues, and see how min-height displays across Outlook, Gmail, and Apple Mail. Free, no account needed.

Instant live preview · No signup required · 21 email engines

Last tested upstream: · Last synced by Emailens:

caniemail.com (MIT) records Nov 29, 2021 as the last time min-height was tested in a real client, 4 years before this sync. Syncing copies that result forward, it does not re-test it. Carried in @emailens/engine data v0.12.2.