We have the free Office 365 Education licensing which includes SharePoint online.
I'm looking to deploy a team site in order for a few internal staff members to, every once in a while, send/receive files that they would otherwise be e-mailing as .zip attachments, with vendors.
This would be since we are blocking .zip files in e-mail.
I am curious if it would be ok to temporarily assign a email@example.com login to an external vendor to login to SharePoint with in order to upload files to a folder/site they're given permissions to. Then remove it.
Or would we have to pay for that license legally?
Or, I'm wondering if I create a Group or site, if I could have a mailbox for it that only allows e-mail from the specific vendor's e-mail address, so they could simply e-mail a file to an @onmicrosoft.com mailbox so it would show up in a document center for our internal user to then login to the site with and download/access.