If you are a professional such as a valuer or offering collection curation services, you may have multiple clients who want you to work on their PreciousLists collections. If they have a platinum subscription then they can invite you to their collection by using your email address. This is a great feature, but each email address can only be registered to one account, so if you have your own collection or another customer registered to examplename@gmail.com then you cannot ask a new customer to link to the same email address.
A useful trick with Google gmail (and possibly with other providers as well) is that if your customer invites you using the email address examplename+1@gmail.com then you will receive an email at your usual address examplename@gmail.com which you can then use to create a new PreciousLists account with the email address exaplename+1@gmail.com and a password.
You can use many other email addresses such as examplename+2@gmail.com; examplename+3@gmail.com; or, examplename+anything@gmail.com etc
