ericadecker on "[Plugin: Email Users] Quick fix to save ' exclude sender from email recipient list' setting"

On line 123 of email_users_options_form.php, you should see:
<input type="checkbox" name="mailusers_from__sender_exclude" id="mailusers_from__sender_exclude" value="true" <?php if (mailusers_get_from_sender_exclude()=='true') echo 'checked="checked"';?> ></input>

Remove the extra underscores before 'sender', and you should be able to save that setting:
<input type="checkbox" name="mailusers_from_sender_exclude" id="mailusers_from_sender_exclude" value="true" <?php if (mailusers_get_from_sender_exclude()=='true') echo 'checked="checked"';?> ></input>

http://wordpress.org/extend/plugins/email-users/