I have heard the argument that, in the case of e-mail text, that two spaces are permissible. I personally don't agree. It's been such a struggle to get most of us to remember to use one space rather than two that creating an exception seems to be asking for a step backwards. Also, keep in mind that e-mail programs use the fonts in your computer system which are proportional fonts anyway. If you disagree with the need for one space or two, here's an additional thought.
Web pages use only one space between sentences.
HTML is set up to only display one space no matter how many are typed. A browser, like Netscape Navigator or Internet Explorer, will only display one. My Design Studio. Please read our terms of use .