Disclaimer: These instructions pertain specifically to Excel 2007.
If I were to do that, I would copy the macro code into a text file and email it to the recipient. I would then pay a visit to their workstation and ask them to open their email and an Excel session. Next, I'd begin to record a macro then immediately cancel the macro recording. Then I would enter the VBA editor and paste the code into their personal macro workbook. Finally, if they wanted quick access to that macro, I would click the Quick Access toolbar and choose Quick Access Toolbar. Choose More Commands, then Choose commands from: Macros. Find the macro, click the Add button and click OK to close the toolbar customization dialogue.
I hope that helps.