With the V2.3 of the software, a user can only set their initial password upon recieving an E-Mail. Should the E-Mail function not be used and no E-Mails will be sent out via the system, then a local E-Mail server is the only solution.
Rotronic recommend the following one: https://github.com/ChangemakerStudios/Papercut-SMTP
Rotronic recommend the following one: https://github.com/ChangemakerStudios/Papercut-SMTP