The public folder user account can receive and send email just like any other user account.

To give employees access to incoming emails, you share the inbox of the account and link it among the users.

To enable employees to use the public folder as the sender's address, set up a suitable outgoing mail identity for the employees as described in Section 20.3.2, „Multiple Outgoing Mail Identities“. You should also define the subfolder "Sent items" of the public folder as a folder for sent messages, so that these can also be managed centrally and viewed by all employees.