主页 / user-724039

Luuk's questions

Martin Hope
Luuk
Asked: 2025-03-09 21:49:20 +0800 CST
  • 5

我在 C# 中创建了一些代码，用于从我的（本地/NAS）IMAP 服务器上的文件夹中读取电子邮件。代码尚未完成，但最终我希望获得所有邮件主题的列表。

以下代码的响应是：

Total messages: 93
MessageError 0: The IMAP server has unexpectedly disconnected.

这个问题：“IMAP服务器意外断开连接”使用993端口和MailKit并没有解决问题，因为我通过993端口访问时也遇到了这个问题，现在通过143端口访问仍然遇到同样的问题。

当使用 Thunderbird 检查该文件夹时，我确实看到了那 93 条消息（并且我能够阅读这些消息）。

如能获得任何帮助并阅读这些消息，我们将不胜感激。

public static void CheckIMAP()
{
    using (var client = new ImapClient(new ProtocolLogger(@"d:\temp\imap.log")))
    {
        //client.Connect(mailserver, 993, true);
        client.Connect(mailserver, 993, SecureSocketOptions.SslOnConnect);
        //client.Connect(mailserver, 143, SecureSocketOptions.None);

        client.Authenticate(username, password);

        IMailFolder folder = client.GetFolder("INBOX.subfolder");
        var fo = folder.Open(FolderAccess.ReadOnly);
        Console.WriteLine ("Total messages: {0}", folder.Count);
        for (int i = 0; i < folder.Count; i++)
        {
            try
            {
                var message = folder.GetMessage(i);
                Console.WriteLine("Message: {0}", message.Subject);
            }
            catch (Exception ex)
            {
                System.Console.WriteLine($"MessageError {i}: {ex.Message}");
                break;
            }
        }
        System.Console.WriteLine();

        client.Disconnect(true);
    }
}

该程序的最终结果应该几乎与在我的 NAS 上运行的这个 Linux 命令相同（因为消息的日期也应该在结果中，但这不是现在的问题）：

$ grep '^Subject:' ~/.Maildir/.INBOX.subfolder/cur/*

版本：

Mailkit：4.10.0；Dotnet：9.0.200

在 Windows 11 上开发，完成后应该可以在 Linux 下运行（在我的 Synology NAS 上）

编辑：

的内容imap.log：

Connected to imaps://example.com:993/
S: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN] Dovecot ready.
C: A00000000 AUTHENTICATE PLAIN ********
S: A00000000 OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY PREVIEW=FUZZY PREVIEW STATUS=SIZE SAVEDATE LITERAL+ NOTIFY SPECIAL-USE] Logged in
C: A00000001 NAMESPACE
S: * NAMESPACE (("" ".")) NIL NIL
S: A00000001 OK Namespace completed (0.001 + 0.000 secs).
C: A00000002 LIST "" "INBOX" RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\Subscribed \HasChildren) "." INBOX
S: A00000002 OK List completed (0.076 + 0.000 + 0.075 secs).
C: A00000003 LIST (SPECIAL-USE) "" "*" RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\Subscribed \HasNoChildren \UnMarked \Drafts) "." Drafts
S: * LIST (\Subscribed \HasNoChildren \Sent) "." Sent
S: * LIST (\Subscribed \HasNoChildren \UnMarked \Junk) "." Junk
S: * LIST (\Subscribed \HasNoChildren \UnMarked \Trash) "." Trash
S: A00000003 OK List completed (0.007 + 0.000 + 0.006 secs).
C: A00000004 LIST "" INBOX.subfolder RETURN (SUBSCRIBED CHILDREN)
S: * LIST (\Subscribed \HasNoChildren) "." INBOX.subfolder
S: A00000004 OK List completed (0.007 + 0.000 + 0.006 secs).
C: A00000005 EXAMINE INBOX.subfolder (CONDSTORE)
S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
S: * OK [PERMANENTFLAGS ()] Read-only mailbox.
S: * 93 EXISTS
S: * 0 RECENT
S: * OK [UIDVALIDITY 1516544306] UIDs valid
S: * OK [UIDNEXT 103] Predicted next UID
S: * OK [HIGHESTMODSEQ 158] Highest
S: A00000005 OK [READ-ONLY] Examine completed (0.005 + 0.000 + 0.004 secs).
C: A00000006 FETCH 1 (BODY.PEEK[])
S: * 1 FETCH (BODY[] {950}
S: Return-Path: <[email protected]>
S: X-Original-To: [email protected]
S: Delivered-To: [email protected]
S: Received: from <obfuscated>
S:  (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits)
S:   key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256)
S:  (No client certificate requested)
S:  by example.com (Postfix) with ESMTPSA id BB6801EF0A5
S:  for <[email protected]>; Thu, 11 Apr 2024 20:14:49 +0200 (CEST)
S: X-Is-Generated-Message-Id: true
S: MIME-Version: 1.0
S: Content-Transfer-Encoding: quoted-printable
S: Content-Type: text/plain;
S:  charset=UTF-8
S: Subject: <obfuscated>
S: From: Luuk <[email protected]>
S: Date: Thu, 9 Apr 2024 20:14:48 +0200
S: To: [email protected]
S: Message-ID: <[email protected]>
S: X-MailScanner-ID: BB6801EF0A5.A5150
S: X-MailScanner: Found to be clean
S: X-MailScanner-From: [email protected]
S: X-Spam-Status: No
S: 
S:
c#