Alan Smithee Jr. said:
Even if you don't use Word as your email editor this "double" line
spacing will still happen using HTML format; and using Shift+Enter
will prevent the "double" line spacing.
You may be correct regarding HTML depending on your Outlook
configuration, probably because Outlook inserts a <P> paragraph tag
instead of a <BR> line break tag (which Shift+Enter will do). Outlook
doesn't let you switch between rendered view and raw data modes to allow
you to edit the HTML tags. However, I sent HTML-formatted test e-mails
using the embedded e-mail editor in Outlook 2002 and there is no extra
whitespace between paragraphs.
I rarely use HTML because it is rarely required for the formatting of
the message. It ends up doubling the size of the message: one part for
a plain-text MIME section another MIME section for the HTML part. So
you end up with duplicate content in your message that couldn've simply
be sent in plain-text format. Anything requiring significant formatting
or structure is usually written in Word (or whatever application) and I
attach that file to the message. The HTML editor in Outlook is
simplistic (i.e., it sucks). You might want to compose in a better HTML
editor and then copy it into Outlook or use the send e-mail function in
the better HTML editor.