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box-shadow in Yahoo Mail iOS

Not supported box-shadow is not supported in Yahoo Mail iOS.

Works in 14 of 21 · partial in 2 · not supported in 5

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

Your reader in Yahoo Mail iOS sees the email without box-shadow, even if it looks right where you tested it.

What to do instead in Yahoo Mail iOS

Use border as a fallback for box-shadow

instead 
.card {
  border: 1px solid #e0e0e0;
  /* box-shadow as progressive enhancement */
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
Show the original
before 
.card {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

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What Yahoo Mail iOS does with box-shadow

@emailens/engine 0.18.22 on the original code

Yahoo Mail iOS does not support "box-shadow".

Your next question

Every feature in Yahoo Mail iOS · box-shadow in every client

Questions

How many email clients support box-shadow?
It works in 14 of 21, partial in 2, not supported in 5.
What do I use instead of box-shadow in Yahoo Mail iOS?
Use border as a fallback for box-shadow.
Does box-shadow work in Yahoo Mail Android?
box-shadow is not supported in Yahoo Mail Android. Closest to Yahoo Mail iOS: Yahoo Mail Android, which agrees on 284 of the 297 features both are tested on.

To see what else in your email Yahoo Mail iOS does not support, paste the whole email.

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Real captures 14 Oct 2026 on 11 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 20 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping