Contributors have the option to make their email address visible on their contributor profile page.
If you are searching and browsing the Directory of Contributors and wish to contact a particular contributor, click on the contributor’s name to view their contributor profile page. If they have made their email address visible on their contributor profile page, you can contact them via email.
If you are searching and browsing resources and wish to contact a contributor associated with a particular resource, click on the contributor’s name in the full resource record. This will take you to their contributor profile page. If they have made their email address visible on their contributor profile page, you can contact them via email about their Sandbox resource.
See also the ACRL Framework Sandbox Community Guidelines.