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ImapAuthentication Plain login

I had an issue with the ImapClient connection because of special characters in my password. After I changed my password everything worked properly.
I investigated this a bit further, and it turns out that there is a PLAIN authentication option that I should use. I found the ImapAuthentication class having the required feature. (https://reference.aspose.com/email/net/aspose.email.clients.imap/imapauthentication/properties/plaintextauthentication)
But… this class is obsolete… and I cannot find any examples on how to use it.
How do I solve this in the current version?

using System;
using Aspose.Email.Clients;
using Aspose.Email.Clients.Base;
using Aspose.Email.Clients.Imap;

namespace JustTesting
    class Program
    static void Main(string[] args)
        var host = "mail.papasmurf.nl";
        var port = 143;
        var user = "test@papasmurf.nl";
        var pass = "pP{hKrMiJ%5r";
        //pass = "xxxxxxxxxx"; // I do not disclose my real password

        ImapClient client = new ImapClient();
        client.Host = host;
        client.Username = user;
        client.Password = pass;
        client.Port = port;
        client.UseDefaultCredentials = true;
        client.SecurityOptions = SecurityOptions.None;
        Console.WriteLine($"ConnectionState = {client.ConnectionState}");
        var f = client.ListFolders();
        foreach (var imapFolderInfo in f)

        Console.WriteLine("Hello World!");


I have encountered exception while listing folders on my end using provided sample code. A ticket with ID EMAILNET-39889 has been created to further investigate and resolve the issue. This thread has been linked with the issue so that you may be notified once issue will be fixed.