/// <summary>
/// 发送邮件
/// </summary>
/// <param name="receivers">收件人邮箱列表</param>
/// <param name="senderAddress">发件人邮箱</param>
/// <param name="senderPasscode">发件人密码</param>
/// <param name="emailBody">邮件内容</param>
/// <param name="emailTitle">邮件标题</param>
/// <param name="enableSsl">是否启用SSL</param>
/// <param name="emailAttachments">邮件附件</param>
public static void SendEmail(List <string> receivers, string senderAddress, string senderPasscode, string emailBody, string emailTitle, bool enableSsl, params FileInfo[] emailAttachments)
{
if (string.IsNullOrEmpty(senderAddress) || !RegularUtil.RegexEmail(senderAddress))
{
throw new ArgumentException("请填写有效的发件人邮箱", "senderAddress");
}
//定义一个邮件对象
MailMessage mailMessage = new MailMessage();
//循环收件人列表添加收件人
foreach (string receiveAddress in receivers)
{
if (string.IsNullOrEmpty(receiveAddress) || !RegularUtil.RegexEmail(receiveAddress))
{
continue;
}
mailMessage.To.Add(receiveAddress);
}
if (mailMessage.To.Count <= 0)
{
throw new ArgumentException("请填写收件人");
}
//添加发件人
mailMessage.From = new MailAddress(senderAddress, DeviceUtil.GetSystemUserName());
//设置邮件标题
mailMessage.Subject = emailTitle;
//设置邮件内容
mailMessage.Body = emailBody;
//默认使用HTML格式的邮件内容
mailMessage.IsBodyHtml = true;
//邮件内容编码使用默认编码
mailMessage.BodyEncoding = Encoding.Default;
//设置邮件优先级为普通，似乎是过高容易被当成垃圾邮件
mailMessage.Priority = MailPriority.Normal;
//如果附件列表不为空且包含附件
if (emailAttachments != null && emailAttachments.Length > 0)
{
//循环附件列表添加附件
foreach (FileInfo attachmentFile in emailAttachments)
{
//定义一个附件对象并设置附件路径，附件的创建，修改，访问时间
Attachment attachment = new Attachment(attachmentFile.FullName);
ContentDisposition contentDisposition = attachment.ContentDisposition;
contentDisposition.CreationDate = attachmentFile.CreationTime;
contentDisposition.ModificationDate = attachmentFile.LastWriteTime;
contentDisposition.ReadDate = attachmentFile.LastAccessTime;
mailMessage.Attachments.Add(attachment);
}
}
//定义一个Smtp客户端对象
SmtpClient smtpClient = new SmtpClient();
//获取第一个收件人的地址
string firstReciever = receivers.Where(p => p.IndexOf('@') > -1).FirstOrDefault();
//计算收件人的Smtp协议
int hostStart = firstReciever.IndexOf('@');
string smtpHost = string.Format("smtp{0}", firstReciever.Substring(hostStart, firstReciever.Length - hostStart).Replace('@', '.'));
//设置smtp协议
smtpClient.Host = smtpHost;
//设置是否启用SSL
smtpClient.EnableSsl = enableSsl;
//设置Smtp客户端使用默认的身份验证方式
smtpClient.UseDefaultCredentials = true;
//设置Smtp客户端的用户密码，用于发送邮件
smtpClient.Credentials = new NetworkCredential(mailMessage.From.Address, senderPasscode);
//设置客户端发送邮件的方式为网络的方式
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
try
{
//开始发送邮件
smtpClient.SendMailAsync(mailMessage).Wait();
}
catch (Exception ex)
{
LogUtil.WriteLog(ex);
//如果错误提示为需要开启SSL并且没有打开SSL
if (ex.Message == "need EHLO and AUTH first" && !enableSsl)
{
//迭代发送邮件并启用SSL
SendEmail(receivers, senderAddress, senderPasscode, emailBody, emailTitle, true, emailAttachments);
}
else
{
//否则有可能发件失败了，抛出异常
throw ex;
}
}
}
