You can copy and paste the following code into the Email Reply Theme to make your emails look like they are sent from gmail.

1. Desk.com gmail style email reply template.html

{% assign emails = case.emails %}
{% assign threadlength = emails.size|minus:1 %}  
{% for email in emails reversed %}
 
{% if forloop.first %}
 
{{email.new_html}}
 
{% if email.agent %}
{% if email.agent.signature %}
<div style="margin-top:10px;"> {{email.agent.signature | newline_to_br}}</div>
{% else %}
<p>
  --<br />
  {{email.agent.name_public}}<br />
</p>
{% endif %}
{% endif %}
 
{% else %}
 
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  On {{email.created_at | in_time_zone: site.timezone | date: "%b %d, %Y”}} at {{email.created_at | in_time_zone: site.timezone | date: "%I:%M%p %Z"}} {{email.from}} &lt;{{email.from_address}}&gt; wrote:<br/><br />
 
{{email.new_html}}
 
{% if email.agent %}
{% if email.agent.signature %}
<div style="margin-top:10px;"> {{email.agent.signature | newline_to_br}}</div>
{% else %}
<p>
  --<br />
  {{email.agent.name_public}}<br />
</p>
{% endif %}
{% endif %}
 
{% endif %}
  
  <br />
 
{% endfor %}
{% for i in (1..threadlength) %} {{ '</blockquote>' }} {% endfor %}

2. Desk.com gmail style email reply template.txt

{% assign emails = case.emails %}{% for email in emails reversed %}
{% unless forloop.first %}
On {{email.send_at | in_time_zone: site.timezone | date: "%b %d, %Y"}} at {{email.send_at | in_time_zone: site.timezone | date: "%I:%M%p %Z"}}, {% if email.agent %}{{email.agent.name_public}} {% else %}{% if customer.id == email.from_customer.id %}{{customer.first_name}} <{{ customer.email }}>{% else %}{{email.from_customer.first_name}} <{{ email.from_customer.email }}>{% endif %}{% endif %}  wrote:
{% endunless %}
{{email.new_text}}
{% if email.agent %}
--
{% if email.agent.signature %}{{email.agent.signature | strip_html }}{%else%}{{email.agent.name_public}}{% endif %}
{% endif %}{% endfor %}

Great job! Works well 👍

or just get a theme for your Desk email reply that's easy to brand

Is there a forward theme that looks like the Gmail format?