It's better to send a ZIP as it should be smaller (and some mail services block other types of file).
However, as MrsBadger said, you can export as HTML (a web page format)
On MS Internet Explorer, in the FILE menu, click on "Import/Export"
Then use "Export Favorites"
You can then export everything (handy as a backup onto a USB stick so you can find some favourite bookmark when you have to be away from your main PC), or choose a folder within the list - I have one called "WebDesign" (though probably untouched for years as I don't use MSIE very often)
When you have decided what to 'export' and click next, you can choose where to store the exported file - default is in "My Documents" but obviously you could save in some other directory (I often use C:\Internet for everything off the net) or a different drive (like a USB Stick or memory card).
The default name is "bookmark.htm" which is fine if you want to send on to someone (or you might call it "-bookmarks.html" so it won't clash with an existing 'bookmark.htm' they might have saved.
I make a backup of my bookmarks every couple of months, so name mine with YYMM in the name - eg bookmark-FF-0908.html (for 2009/08 FireFox bookmarks, as I use FF, Netscape and Opera browsers)