Commandline App | Postal library | postal.connect | I get nothing back (no error or else)

[sm-a]

Hello,

I am new in this library and I hope I get help here. I use Swift 5.

When I use the following code I get only "ENDED" but nothing else back in the console. No error message. What I am doing wrong?

A happy New Year to all.

Greetings,
Sven

import Foundation      
import Postal  
    
let postal : Postal = Postal(configuration: Configuration(hostname: "email.none.none", port: 993, login: "none@none.none", password: .plain("test"), connectionType: .tls, checkCertificateEnabled: true, batchSize: 1000, spamFolderName: "junk"))  
    
func getEmail() {  
    let indexset = IndexSet(integer: 1)  
    postal.fetchMessages("INBOX", uids: indexset, flags: [ .headers ], onMessage: { email in  
        print("new email received: \(email)")  
    }, onComplete: { error in  
        if error == error {  
            print("an error occured: \(error)")  
        }  
    })  
}  
    
postal.connect { result in  
    switch result {  
    case .success:  
        getEmail()  
    case .failure(let error):  
        print("error: \(error)")  
    }  
}  
    
print("ENDED")