You are referencing a wildcard in your template but there is no wildcard in your pattern. The rest is correct though. However, it’s up to your interpreter to say what the url tag does. Are you using Pandorabots.com to make your bot? If so, this will work by using a button:
<category>
<pattern>TEST EMAIL</pattern>
<template>Shall I send a test email?
<button>
<text>That sounds good</text>
<url>mailto:abc@gmail.com?Subject=New Email Address&
Body=A new email address:
</url>
</button>
</template>
</category>
More details here: https://www.chatbots.org/ai_zone/viewthread/3454/
You can also try this much older method which may still work:
<category>
<pattern>SEND *</pattern>
<template>Try sending mail to Dr. Wallace (<a target="_new" href="mailto:[email protected]">drwallace@alicebot.org</a>)
<think><set name="he">Dr. Wallace</set></think>
</template></category>