Images are difficult to show on email signature as most email clients
will not show them because of spamming concerns.
Some email client like outlook automically embed the image into
signature html. These kind of images shows up in many email client.
In
sig22.com use the local machine file path for images (e.g. c:\images
\image.png), then when you import the image into outlook, it will
automatically embed it in the signature.