MyBB Community Forums

you can wipe out the content in showthread_send_thread template of the theme

admin panel >> Templates & Style >> templates >> your theme templates >>
Show Thread Templates >> showthread_send_thread

Edit: however it is a facility to send link of the thread. content of entire thread is not sent through mail

Do I just delete the file?

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I guess I should ask do I just delete the code?

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<li class="sendthread"><a href="sendthread.php?tid={$tid}">{$lang->send_thread}</a></li>

^ yes, you can delete that code

You also need to remove sendthread.php as you said, otherwise people will still be able to enter it.