tofuSCHNITZEL
The system connects to the mail server via the hostname and port, then it logs in as the email on the mailserver using the configured authentication credentials, then it sends out the email on the mailserver. Thats simply how SMTP works.
If you go to the helpdesk@ email in the admin panel, click the Outgoing (SMTP) tab, make sure it’s enabled, and click Save Changes at the bottom does it save successfully?
Cheers.