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text-shadow in Outlook 365

Works text-shadow works in Outlook 365.

Works in 12 of 21 · not supported in 9

Which clients
Works
Outlook 365, Outlook Android, Apple Mail, Apple Mail iOS, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman
Not supported
Gmail, Gmail Android, Gmail iOS, Outlook (New), Outlook Classic, Outlook iOS, Outlook for Mac, Yahoo Mail, Yahoo Mail Android

The fix for the clients that need it

Needed in 9 of 21: Gmail, Gmail Android, Gmail iOS and 6 more.

Use font-weight or border-bottom as alternatives to text-shadow

instead 
.glow {
  /* text-shadow is not supported in Gmail, Outlook, Yahoo.
     Use font-weight or letter-spacing for emphasis instead. */
  font-weight: bold;
  letter-spacing: 0.5px;
}
Show the original
before 
.glow {
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

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What Outlook 365 does with text-shadow

The Emailens probe for text-shadow on a real install counted as Outlook 365, captured 14 Oct 2026. It shows the probe, not the fix. Where text-shadow is supported it shows: text with a red shadow.

Outlook 365

caniemail: text-shadow works in Outlook 365.

Emailens live preview of Outlook 365 Our live preview The same probe in the Emailens live preview of Outlook 365

This Outlook.com install drops the <style> in the head, so only inline styles apply.

caniemail record, tested upstream 28 Feb 2019

  • Observed 2026-10-14 (Emailens real-device probe, Outlook.com (Chrome)): A red text-shadow rendered behind bold text.

Your next question

Every feature in Outlook 365 · text-shadow in every client

Questions

How many email clients support text-shadow?
It works in 12 of 21, not supported in 9.
Does text-shadow work in Outlook (New)?
text-shadow is not supported in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.

To see what in your email Outlook 365 does not support, paste the whole email.

The checker needs a computer screen.

Real captures 14 Oct 2026 on 11 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Feb 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping