Probably not the best solution but the dirtiest...
If you are just concerned with email addresses (not phone #s, fax #s, street addresses, etc) you can just create an email and type in each of the email addresses on its own line.
When a user receives your email, they just need to scroll through, selecting each address and then hit the scroll wheel and select Add to Address Book, Click scroll wheel again, Select Save and then go on to the next email address.
I've done this for about 10 addresses before and it only took about a minute.
You do have the option to add phone #s, street addresses, etc but of course that will add to the total time it takes to enter all of the contact information.