There are dozens of auto-formatting "features" that piss me off each and every day across all of Microsoft's products.
- use the mouse to select precisely the part of the word/URL/string you want for Ctrl-C purposes
- it autocorrects your selection to the whole word including a CrLf if it is nearby.
Aaargh!
The only workaround I've found to be effective is selecting a few letters on one end of your intended selection and using ctrl+arrows to precisely select.
Have you ever posted a code snippit into a default install of Outlook?