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scotty
Newbie
Joined: 27 August 2007
Online Status: Offline
Posts: 25
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| Posted: 02 November 2009 at 5:35am | IP Logged
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Hi,
When I try to download the Header of a certain Email-Message using POP3.DownloadMessageHeader() I get the following exception:
MailBee.MailBeeSocketObjectDisposedException: The socket object used by MailBee was unexpectedly closed. InnerException message follows: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at dr.a(Byte[] A_0, Int32 A_1)
--- End of inner exception stack trace ---
at dr.a(Exception A_0)
at dr.a(Byte[] A_0, Int32 A_1)
at dx.a(Byte[] A_0, Int32 A_1)
at cz.ak()
at bb.b(String A_0, e5 A_1, Boolean A_2)
at a2.b(Int32 A_0, Int32 A_1)
at bk.a(Int32 A_0, Int32 A_1)
at bk.a(Boolean A_0, Int32 A_1, Int32 A_2)
at MailBee.Pop3Mail.Pop3.DownloadMessageHeader(Int32 index)
Calling POP3.DownloadMessage() for the message works fine. Only POP3.DownloadMessageHeader() throws an exception.
The Raw-Text of the EMail-Message I am trying to download looks like this:
Received: from unknown (HELO t-online.de) (61.134.43.24)
by ro10958.plusserver.de with SMTP; 1 Nov 2009 16:42:33 +0100
Message-ID: <B5884B35.41921471@t-online.de>
Date: Mon, 02 Nov 2009 13:36:31 +0100
From: "Important message" <test@t-online.de>
User-Agent: Netscape6/6.1b1
X-Accept-Language: en-us
MIME-Version: 1.0
To: "Administrator" <office@wowiwi.com>
Subject: Important Message
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: base64
DQpIYWxsbywNCg0KU2llICB3dXJkZW4gdm9uIGVpbmVuICBhbHRlbiAgU2No dWxmcmV1bmQgIHp1
[...]
Is this a bug? Which part of the email-Message causes this behavior? Do you know a workaround?
Regards, Scotty
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Andrew
AfterLogic Support
Joined: 28 April 2006
Location: United States
Online Status: Offline
Posts: 1189
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| Posted: 02 November 2009 at 6:51am | IP Logged
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That exception means the POP3 server did not respond for a long time (30 sec timeout) and the network socket was closed. That's rather a problem of the POP3 server because downloading headers of a certain message causes it to not respond for a long time.
There's nothing to do on MailBee.NET POP3 side, the only thing is to try increasing Pop3.Timeout. If increasing the timeout doesn't help, you should look for the reason on the POP3 server side. Perhaps, it makes sense to upgrade it to the latest version.
Best regards,
Andrew
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scotty
Newbie
Joined: 27 August 2007
Online Status: Offline
Posts: 25
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| Posted: 03 November 2009 at 6:28am | IP Logged
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The problem seems to be caused by our firewall.
On retrieval from the POP3-Server it identifies the mail as spam and inserts some base64-encoded lines into the response.
The same happens if DownloadMessageHeader() is used to download only the header but this time the base64-encoded lines are inserted directly before the termination marker(.) of the response string. So instead of ending with CRLF.CRLF the response ends with .CRLF causing DownloadMessageHeader() to expect more data and run into a timeout.
Thanks for your fast response.
Regards, scotty.
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