frappe/frappe/email/page/email_inbox/email_inbox_sidebar.html

<ul class="list-unstyled sidebar-menu user-actions">
	<li class="divider"></li>
</ul>
<ul class="list-unstyled sidebar-menu standard-actions">
	<li class="divider"></li>
	<li class="list-link" data-view="List">
		<a class="email-account" data-account="Sent">{%= __("Sent") %}</a>
	</li>
</ul>
<ul class="list-unstyled sidebar-menu standard-actions">
	<li class="divider"></li>
	<li class="list-link"><h6>Email Accounts</h6></li>
	{% for(var i=0, l=data.length; i<l; i++) { %}
		<li class="divider"></li>
		<li class="list-link" data-view="List">
			<a class="email-account {%= i==0?"strong": "" %}" data-account="{%= data[i].account %}">{%= __(data[i].title) %}</a>
		</li>
	{% } %}
</ul>