Set up email templates such that the customer support signature, subject line and email body are defaulted.

We need all of the email templates to include the body of the previous email.  

This seems to be working so far.

{!EmailMessage.TextBody}  in the end of the HTML template. 

We need the subject line to be pulled from the original email. 

So far, so good...

{!EmailMessage.Subject}

We need customer support reps signatures to be uniform and have the image for our company included. 

Using a trick in one of the success forum posts I've created a custom rich text field  and added the image as a link in that. 

Customer Support

Company link | LinkedIn | Facebook

"company image as a web link"

"legal info"

This is also working so far. 

>>>>>

New thoughts 15th Aug 2016

added html into the out-of-the-box signatures in salesforce. 

<p><strong>Luke Higgins</strong><br />Salesforce Administrator<br /><strong>P</strong> +1 (615) 555-7537&nbsp; |&nbsp; <strong>M</strong> +1 (615) 555-3875<br /><a href="https://www.con.com/">Con.com </a>&nbsp;|&nbsp; <a href="https://www.linkedin.com/company/concom">LinkedIn </a>&nbsp;|&nbsp; <a href="https://twitter.com/C">Twitter</a><br /><img src="https://www.con.com/media/72637/conb_190_67.png?width=190&amp;height=67" alt="" width="190" height="67" /><br />One platform etc... </p>

<p>The information in this message is confidential and may be legally privileged. It is intended solely for the addressee.&nbsp; Access to this message by anyone else is unauthorized.&nbsp; If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message in error. Thank you.</p>


used this site.    http://wordtohtml.net/