Subject: Bounce Inspector, NET 5 and "Object reference not set to an instance of an object."
Date: 2021-03-22 16:23:19
From: bolk
Source: bounce-inspector-net-5-object-reference-not-set-instance-object


I'm trying the library on a .NET 5 project.
I have some bounced emails in the inbox (from different servers) but when checking with the library, I see that it doesn't get Identified as bounced.
When inspectng in debug, I see that the BounceResultCollection has an error:

        Addresses: null
        BounceCategory: null
        BounceType: null
        Delete: false
        Dsn: null
        Error: {"Object reference not set to an instance of an object."}
        FileDeleted: false
        FilePath: null
        Identified: false
        InboxDelete: false
        InboxDeleted: false
        MailMessage: null
        SequenceNumber: 0
        SignatureId: -1
        Skipped: false
        Tag: null
        UniqueId: null

specifically the result error is:

    {"Object reference not set to an instance of an object."}
        Data: {System.Collections.ListDictionaryInternal}
        HResult: -2147467261
        HelpLink: null
        InnerException: null
        Message: "Object reference not set to an instance of an object."
        Source: "ComponentPro.BounceInspector.NetCore"
        StackTrace: "   at ComponentPro.Net.Mail.BounceInspector.c_e8156728(String )\r\n   at ComponentPro.Net.Mail.BounceInspector.c_ce871252(Imap , String , ImapMessageCollection , String , AsyncOperation )"
        TargetSite: {System.String c_e8156728(System.String)}

Any clue of what I'm missing?
The code is pretty straightforward from the documentation:

                filter.Processed  = MessageProcessed;
                ImapMessageCollection list = client.ListMessages(ImapEnvelopeParts.MessageInboxIndex | ImapEnvelopeParts.Size, ImapCriterion.DontHaveFlags(ImapMessageFlags.Seen));
                // Process all messages.
                BounceResultCollection result = await filter.ProcessMessagesAsync(client, config["bounce"]["workingFolder"].ToString(), list, mailsPath);
                // Display processed emails.
                foreach (BounceResult r in result)
                        // If this is a detected bounce.
                        if (r.Identified)
                            logger.Info("FileName: {0}\nSubject: {1}\nAddress: {2}\nBounce Category: {3}\nBounce Type: {4}\nDeleted: {5}\nDSN Action: {6}\nDSN Diagnostic Code: {7}\n\n",


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