Yes you can by using script/html tag but it’ll need a web space to store your company’s logo image file so that any employee of your company would be able to point to. If your company already had a website, you can point to that website’s logo image file as well

Here is one example of using xml and html file on my signature

I create an xml file call filelist.xml, it contents script below

<xml xmlns:o=”urn:schemas-microsoft-com:office:office”>
<o:MainFile HRef=”../vt_sig.html”/>
<o:File HRef=”image001.gif”/> —->image001.gif, or http://companyA.com/image001.gif
<o:File HRef=”filelist.xml”/>
</xml>

then I create another file call vt_sig.html which is your signature file

you can compose these file by using windows notepad