We use a fixed-width design concept for all of our email branding services.
The advantage of doing this means that all the emails will appear
proportionally correct regardless of the recipient's monitor resolution.

This also means that no one will need to scroll scroll horizontally to read your email, and that emails printed on a4 sized paper will be printed correctly and read easily.

Assuming that the window is maximized, the following 3 screenshots show how the eLetterhead looks in the inbox at different screen resolutions.