It would be helpful if the format for the email addresses is listed somewhere! I just wasted 30 minutes editing a list of email addresses trying to find something that works, and in the end, only the email@address.com works--which makes it extremely hard to track who those emails are for.

For one thing, the Send Invite dialog box lists the FROM address in this format: user_name <email@address.com>.

That leads one to think that you can use that format in the TO--but no can do. So I tried enclosing the user_name in quote (a standard way for almost all email applications), and that didn't work either.

For another, the unhelpful and stupid error message simply says, "Some of the e-mail addresses are not valid. Verify the e-mail addresses and try again." No examples of what would work given anywhere. It was frustrating as heck.

There are a lot of things that are nice about Zenfolio, but some of the simplest functions are completely whack.