檢查未讀電子郵件

Question

我正在尋找一種方法來檢查電子郵件帳戶中未讀電子郵件的數量。 有小費嗎？

編輯：如標簽中所述，用於C＃。 我學習IMAP是要走的路，我確認我要使用的所有電子郵件帳戶都已啟用IMAP :)

Answer 1

POP

您可以使用OpenPOP.net使用POP協議讀取電子郵件。 POP的問題在於它無法保存是否未讀的詳細信息。 所以我認為這對你沒有多大用處。 您有自己的方式下載和標記電子郵件為已讀或未讀。

IMAP

SO中的這個問題有一些使用IMAP的示例鏈接。 IMAP有關於郵件狀態（已讀/未讀）的詳細信息。

請詳細說明您的要求。

Answer 2

如果您要做的是獲取IMAP文件夾中未讀郵件的數量，您可以使用MailKit執行此操作：

using MailKit;
using MailKit.Search;
using MailKit.Net.Imap;

...

using (var client = new ImapClient ()) {
    // Note: depending on your server, you might need to connect
    // on port 993 using SecureSocketOptions.SslOnConnect
    client.Connect ("imap.server.com", 143, SecureSocketOptions.StartTls);

    // Note: use your real username/password here...
    client.Authenticate ("username", "password");

    // open the Inbox folder...
    client.Inbox.Open (FolderAccess.ReadOnly);

    // search the folder for new messages (aka recently
    // delivered messages that have not been read yet)
    var uids = client.Inbox.Search (SearchQuery.New);

    Console.WriteLine ("You have {0} new message(s).", uids.Count);

    // ...but maybe you mean unread messages? if so, use this query
    uids = client.Inbox.Search (SearchQuery.NotSeen);

    Console.WriteLine ("You have {0} unread message(s).", uids.Count);

    client.Disconnect (true);
}

Answer 3

以下是LumiSoft IMAP庫的代碼示例：

using LumiSoft.Net.IMAP;
using LumiSoft.Net.IMAP.Client;
using LumiSoft.Net;

...

using (IMAP_Client client = new IMAP_Client())
{
    client.Connect("imap.gmail.com", 993, true);
    client.Login("your.username@gmail.com", "your_cool_password");
    client.SelectFolder("INBOX");

    IMAP_SequenceSet sequence = new IMAP_SequenceSet();
    //sequence.Parse("*:1"); // from first to last

    IMAP_Client_FetchHandler fetchHandler = new IMAP_Client_FetchHandler();

    fetchHandler.NextMessage += new EventHandler(delegate(object s, EventArgs e)
    {
        Console.WriteLine("next message");
    });

    fetchHandler.Envelope += new EventHandler<EventArgs<IMAP_Envelope>>(delegate(object s, EventArgs<IMAP_Envelope> e){
        IMAP_Envelope envelope = e.Value;
        if (envelope.From != null && !String.IsNullOrWhiteSpace(envelope.Subject))
        {
            Console.WriteLine(envelope.Subject);
        }

    });

    // the best way to find unread emails is to perform server search

    int[] unseen_ids = client.Search(false, "UTF-8", "unseen");
    Console.WriteLine("unseen count: " + unseen_ids.Count().ToString());

    // now we need to initiate our sequence of messages to be fetched
    sequence.Parse(string.Join(",", unseen_ids));

    // fetch messages now
    client.Fetch(false, sequence, new IMAP_Fetch_DataItem[] { new IMAP_Fetch_DataItem_Envelope() }, fetchHandler);

    // uncomment this line to mark messages as read
    // client.StoreMessageFlags(false, sequence, IMAP_Flags_SetType.Add, IMAP_MessageFlags.Seen);
}

有點復雜，但工作正常。 Limisoft庫並不完美，所以一定要測試一下。