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AengusO
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Posted: 26 January 2012 at 6:39am | IP Logged Quote AengusO
Hi, I am a user of MailBee.Net Objects - I am using MailBee ImapMail to download mails in a c# Windows service. The version of my MailBee.Net dll is 6.8.2.827.

On one server, I keep getting an error like this:

MailBee.ImapMail.MailBeeImapInvalidEnvelopeException: The envelope data is corrupted or incorrect. Envelope.IsValid will be false. The invalid envelope message number is: 2.
   at a.c.f.a(String A_0, Boolean A_1, EnvelopeParts A_2, Int32 A_3, String[] A_4, String[] A_5, Boolean A_6, Boolean A_7)
   at a.c.f.a(String A_0, Boolean A_1, Int32 A_2, Boolean A_3)
   at a.c.t.a(String A_0, Boolean A_1, Int32 A_2)
   at a.c.t.a(Boolean A_0, String A_1, Boolean A_2, Int32 A_3)
   at MailBee.ImapMail.Imap.DownloadEntireMessages(String messageIndexSet, Boolean indexIsUid)


Sample code from my c# project:

        /// <summary>
        /// Download mail collection
        /// </summary>
        /// <returns></returns>
        protected override MailMessageCollection DownloadEntireMessages1()
        {
            if (GetNextMails() > 0)
            {
               return imap.DownloadEntireMessages(m_CurrentUids.ToString(), true);
            }
            else
            {
               return null;
            }
        }

       /// <summary>
        /// Check for next mails in box
        /// </summary>
        /// <returns></returns>
        private int GetNextMails()
        {
            return GetNextMails(m_FirstInRange, m_FirstInRange + m_BatchSize - 1);
        }

        /// <summary>
        /// Check for next mails in box
        /// </summary>
        /// <param name="FirstSeq"></param>
        /// <param name="LastSeq"></param>
        /// <returns></returns>
        private int GetNextMails(long FirstSeq, long LastSeq)
        {
            int iRetry = 3;
            while (true)
            {
               try
               {
                    if (CheckLoggedIn())
                    {
                        string SeqSearch = FirstSeq.ToString() + ":" + LastSeq.ToString();
                        m_CurrentUids = (UidCollection)imap.Search(true, SeqSearch, null);
                        return m_CurrentUids.Count;
                    }
               }
               catch (Exception ex)
               {
                    if (--iRetry < 0)
                    {
                        LogHelper.Exception(ex, "Error getting next Mail");
                        throw;
                    }
               }
            }
        }



What does this error occur and how can I get around it ?
Regards,
Aengus O'Sullivan
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Alex
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Posted: 26 January 2012 at 11:32am | IP Logged Quote Alex
This usually means the server returns data which cannot be parsed. Some IMAP servers may have flaws in their IMAP implementation. Many servers are tested only against a few popular clients like Outlook and do not correctly support any IMAP commands of syntax Outlook or Thunderbird does not use.

Sometimes, MailBee is able to recover from IMAP syntax violation, you'd check with the latest version.

Regards,
Alex
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AengusO
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Posted: 02 February 2012 at 4:49am | IP Logged Quote AengusO
Thanks for the reply. Have received latest version of MailBee.Net objects, I am waiting for fix to be applied to live server and tested - will update when I get feedback,

Thanks,
Aengus
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AengusO
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Posted: 03 February 2012 at 1:37am | IP Logged Quote AengusO
Have updated server with the latest version of MailBee.NET.dll, still getting same result. What can I do next ? Is there logging I can enable to check whats happening, is there a workaround for this issue ?

Thanks,
Aengus O'Sullivan
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Igor
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Posted: 03 February 2012 at 1:41am | IP Logged Quote Igor
Checking the logs might help indeed. You can enable logging using this property of IMAP object.

--
Regards,
Igor, AfterLogic Support
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AengusO
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Posted: 05 March 2012 at 7:20am | IP Logged Quote AengusO
I upgraded to latest version of MailBee.Net and also changed logic to use DownloadEnvelopes instead of download entire messages - this fixed the issue
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