c# 支持SMTP服务器认证的邮件发送类

/// <summary>

/// 收件人列表

/// </summary>

private Hashtable Recipient=new Hashtable();

/// <summary>

/// 密送收件人列表

/// </summary>

private Hashtable RecipientBCC=new Hashtable();

/// <summary>

/// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"

/// </summary>

private string priority="Normal";

/// <summary>

/// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"

/// </summary>

public string Priority

{

set

{

switch(value.ToLower())

{

case "high":

priority="High";

break;

case "1":

priority="High";

break;

case "normal":

priority="Normal";

break;

case "3":

priority="Normal";

break;

case "low":

priority="Low";

break;