Helix TeamHub uses email to create new user credentials and send application notifications. Therefore, email is required. Helix TeamHub comes with prepackaged Postfix, which is an open-source Mail Transfer Agent (MTA).
Although the default local mailing may be sufficient, a corporate mail gateway is required in most cases. It's possible to configure a remote SMTP server responsible for delivering Helix TeamHub emails. Authentication and TLS are also options.
In order to configure external STMP server, login to Helix TeamHub Admin, navigate to "Mail settings", and choose "SMTP server". The following configuration options are available: