本文演示如何使用 Spire.Email 组件删除特定的电子邮件消息以及所有电子邮件消息。

详细步骤：

Step 1:创建一个POP3客户端。

Pop3Client pop3 = new Pop3Client();

Step 2:设置主机，认证，端口和连接协议。

pop3.Host = "outlook.office365.com";
pop3.Username = "LeonDavisLD@outlook.com";
pop3.Password = "password";
pop3.Port = 995;
pop3.EnableSsl = true;

Step 3:连接pop服务器。

pop3.Connect();

Step 4:删除消息之前获取消息数量。

//Get the number of messages before deleting message(s)
Pop3MessageInfoCollection messages = pop3.GetAllMessages();
Console.WriteLine("Number of messages before deleting: " + messages.Count);

Step 5:删除消息。

//Delete an email message by its sequence number
pop3.DeleteMessage(2);

//Delete all messages
//pop3.DeleteAllMessages();

Step 6:删除消息后获取消息数量。

//Get the number of messages after deleting message(s)
messages = pop3.GetAllMessages();
Console.WriteLine("Number of messages after deleting: " + messages.Count);

完整代码：

[C#]

//Create a POP3 client
Pop3Client pop3 = new Pop3Client();
//Set host, authentication, port and connection protocol
pop3.Host = "outlook.office365.com";
pop3.Username = "LeonDavisLD@outlook.com";
pop3.Password = "password";
pop3.Port = 995;
pop3.EnableSsl = true;
//Connect the pop server
pop3.Connect();
//Get the number of messages before deleting message(s)
Pop3MessageInfoCollection messages = pop3.GetAllMessages();
Console.WriteLine("Number of messages before deleting: " + messages.Count);
//Delete an email message by its sequence number
pop3.DeleteMessage(2);
//Delete all messages
//pop3.DeleteAllMessages();
//Get the number of messages after deleting message(s)
messages = pop3.GetAllMessages();
Console.WriteLine("Number of messages after deleting: " + messages.Count);Console.WriteLine("Number of messages after deleting: " + messages.Count);

[VB.NET]

'Create a POP3 client
Dim pop3 As New Pop3Client()
'Set host, authentication, port and connection protocol
pop3.Host = "outlook.office365.com"
pop3.Username = "LeonDavisLD@outlook.com"
pop3.Password = "password"
pop3.Port = 995
pop3.EnableSsl = True
'Connect the server
pop3.Connect()
'Get the number of messages before deleting message(s)
Dim messages As Pop3MessageInfoCollection = pop3.GetAllMessages()
Console.WriteLine("Number of messages before deleting: " + messages.Count)
'Delete an email message by its sequence number
pop3.DeleteMessage(2)
'Delete all messages
'pop3.DeleteAllMessages();
'Get the number of messages after deleting message(s)
messages = pop3.GetAllMessages()

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