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<form> in Yahoo Mail iOS

Not supported <form> is not supported in Yahoo Mail iOS.

Works in 10 of 21 · partial in 4 · not supported in 7

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

Your reader in Yahoo Mail iOS sees the email without <form>, even if it looks right where you tested it.

The fix for Yahoo Mail iOS

Replace embedded form with a link to a hosted form

after 
<table role="presentation" cellpadding="0" cellspacing="0">
  <tr>
    <td style="background-color: #6d28d9; border-radius: 6px;
               padding: 12px 32px;">
      <a href="https://example.com/subscribe"
        style="color: #fff; text-decoration: none;
               font-family: Arial, sans-serif;
               font-weight: bold;">
        Subscribe Now
      </a>
    </td>
  </tr>
</table>
Show the original
before 
<form action="/subscribe" method="POST">
  <input type="email" placeholder="Email" />
  <button type="submit">Subscribe</button>
</form>

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What Yahoo Mail iOS does with <form>

@emailens/engine 0.18.22 on the original code

Yahoo Mail iOS strips form elements.

Your next question

Every feature in Yahoo Mail iOS · <form> in every client

Questions

How many email clients support <form>?
It works in 10 of 21, partial in 4, not supported in 7.
What do I use instead of <form> in Yahoo Mail iOS?
Replace embedded form with a link to a hosted form.
Does <form> work in Yahoo Mail Android?
<form> works 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.

The checker needs a computer screen.

caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 10 Sep 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping