The way e-mail programs work, they can be formatted in html to specify a font, size, bolding, italics, etc.  For the font to actually display, the person on the other end needs to have that font installed.  This applies to all fonts, not just signature fonts. For example, if you had a very artistic looking invitation using the Benguiat and Garamond fonts, these would probably default to Arial or Helvetica on the recipient's end if he/she did not have those fonts.  Font substitution is a fact of life.  To counter this, programs like MS Word allow one to "embed" a font as part of the document.  More information on this feature is available on our site under the "products" button and then the "embedding" link. If you would like to include a signature in your e-mails, one of the best ways would be to have a bitmapped image on your web server and in your html formatted e-mails refer to this image.  As long as the person is logged on while looking at your e-mail, the signature image should appear.  Alternatively, send them an MS Word or Corel WordPerfect letter in which you embed the signature font.