@Komal-Sharma Thanks a lot for your reply.
uvdesk version from bottom of backend: V -1.1.0
Regarding below data, serverdomain.ch is the replacement for my actual server address. This resolves perfectly, it is the server i'm running uvdesk on. I have also tried localhost as well as the specific cpanel accounts domain, but both result in the same error message.
Also vmb@mydomain.ch is a replacement for the address I'm actually using This email has also already an email in it's inbox.
To be sure it's not password related, I have replaced the password already once, but it didn't help.
[SWIFTMAILER]
Note: SMTP seems to work, I was successfully able to reset my password for logging in and it did send me an email. Maybe it was sent via php sendmail, i actually didn't check that.
Mailer ID: VOH VMB
Transport Type: SMTP
Enable Delivery: Checked
Server: serverdomain.ch
Email: vmb@mydomain.ch
Password: PasswordOfCourse
Port: 465
Encryption Mode: SSL
Sender Address AND Delivery Address: both empty
[MAILBOX]
ID: VOH_VMB
Name: VOH VMB
Enable Mailbox: Checked
Permanently delete from inbox: Checked
Transport: IMAP
Host: serverdomain.ch
Username/Email: vmb@mydomain.ch
Password: Password
Swift Mailer ID: VOH VMB
[EMAIL SETTINGS]
Email ID: vmb@mydomain.ch
Name: SIB Help Portal
Swiftmailer ID: VOH VMB
Thanks very much