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<form> in Yahoo Mail

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

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 sees the email without <form>, even if it looks right where you tested it.

The fix for Yahoo Mail

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 does with <form>

@emailens/engine 0.18.22 on the original code

Yahoo Mail strips form elements.

caniemail record, tested upstream 10 Sep 2019

  • Observed 2026-10-29 (Emailens probe, Yahoo Mail web (Chrome), our own seed inbox): The form is kept but its action is removed (absolute, relative and empty alike), and so is formaction on a button; Yahoo adds target="_blank". The form cannot reach your server: link to a landing page instead. type="email" is also dropped from inputs; method, text, radio and submit inputs are kept.

Your next question

Every feature in Yahoo Mail · <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?
Replace embedded form with a link to a hosted form.
Does <form> work in Yahoo Mail iOS?
<form> is not supported in Yahoo Mail iOS. Closest to Yahoo Mail: Yahoo Mail iOS, which agrees on 282 of the 298 features both are tested on.

To see what else in your email Yahoo Mail 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