/// <summary>
/// 按域进行无代理发送
/// </summary>
/// <param name="domain"></param>
/// <param name="message"></param>
/// <exception cref="Adf.SmtpException"></exception>
public static void Send(string domain, MailMessage message)
{
const int port = 25;
//mx
MXRecordItem mxe = null;
DnsRecord record = DnsRecord.EMPTY;
//
lock (mxrecords)
{
if (mxrecords.TryGetValue(domain, out mxe))
{
try
{
record = mxe.recordList[mxe.index];
if (Environment.TickCount - record.Expired > 0)
{
//set null, trigger dns query
mxe = null;
}
}
catch
{
mxe = null;
}
}
}
//query
if (mxe == null)
{
mxe = new MXRecordItem();
mxe.recordList = DnsHelper.GetMXRecordList(domain);
mxe.index = 0;
if (mxe.recordList == null || mxe.recordList.Count == 0)
{
throw new Adf.SmtpException("dns no found mx record " + domain);
}
//
lock (mxrecords)
{
mxrecords[domain] = mxe;
}
}
Exception firstException;
try
{
for (int i = 0; i < 2; i++)
{
SmtpClient client = null;
string clientKey = record.Value + ":" + port;
lock (clientDictionary)
{
if (clientDictionary.TryGetValue(clientKey, out client) == false)
{
client = new SmtpClient(record.Value, port);
clientDictionary.Add(clientKey, client);
}
else if (client.Connected == false)
{
client.Dispose();
//
client = new SmtpClient(record.Value, port);
clientDictionary[clientKey] = client;
}
}
//
try
{
client.Send(message);
break;
}
catch (IOException)
{
if (i == 1)
{
throw;
}
client.Dispose();
}
}
//成功发送退出
return;
}
catch (Exception exception)
{
//当为 socket 异常时，允许使用其它MX
if (exception.GetBaseException() is SocketException)
{
if (mxe.recordList.Count == 1)
{
throw;
}
firstException = exception;
}
else
{
throw;
}
}
//首选失败后重新选择mx服务器
for (int i = 0, l = mxe.recordList.Count; i <= l; i++)
{
SmtpClient client = null;
try
{
string clientKey = mxe.recordList[i].Value + ":" + port;
lock (clientDictionary)
{
if (clientDictionary.TryGetValue(clientKey, out client) == false)
{
client = new SmtpClient(mxe.recordList[i].Value, port);
clientDictionary.Add(clientKey, client);
}
else if (client.Connected == false)
{
client.Dispose();
//
client = new SmtpClient(mxe.recordList[i].Value, port);
clientDictionary[clientKey] = client;
}
}
//
client.Send(message);
//发送成功，修改首选
mxe.index = i;
//发送成功退出
return;
}
catch (Exception exception)
{
client.Dispose();
//
if (exception.GetBaseException() is SocketException)
{
//当为 socket 异常时，允许使用其它MX
firstException = exception;
}
else
{
throw;
}
}
}
//当首选服务器为列表中最后一个服务器且重试失败时将首选异常丢出.
throw firstException;
}
/// <summary>
/// 按域进行无代理发送
/// </summary>
/// <param name="domain"></param>
/// <param name="message"></param>
/// <exception cref="Adf.SmtpException"></exception>
public void SendNoPorxy(string domain, MailMessage message)
{
const int port = 25;
//mx
MXRecordItem mxe = null;
DnsRecord record = DnsRecord.EMPTY;
//
lock (this.mxrecords)
{
if (this.mxrecords.TryGetValue(domain, out mxe))
{
try
{
record = mxe.recordList[mxe.index];
if (Environment.TickCount - record.Expired > 0)
{
//set null, trigger dns query
mxe = null;
}
}
catch
{
mxe = null;
}
}
}
//query
if (mxe == null)
{
mxe = new MXRecordItem();
mxe.recordList = DnsHelper.GetMXRecordList(domain);
mxe.index = 0;
if (mxe.recordList == null || mxe.recordList.Count == 0)
{
throw new Adf.SmtpException("dns no found mx record " + domain);
}
//
lock (this.mxrecords)
{
this.mxrecords[domain] = mxe;
}
}
Exception firstException;
try
{
new SmtpClient(record.Value, port).Send(message);
//成功发送退出
return;
}
catch (Exception exception)
{
//当为 socket 异常时，允许使用其它MX
if (exception.GetBaseException() is SocketException)
{
if (mxe.recordList.Count == 1)
{
throw;
}
firstException = exception;
}
else
{
throw;
}
}
//首选失败后重新选择mx服务器
for (int i = 0, l = mxe.recordList.Count; i <= l; i++)
{
try
{
new SmtpClient(mxe.recordList[i].Value, port).Send(message);
//发送成功，修改首选
mxe.index = i;
//发送成功退出
return;
}
catch (Exception exception)
{
if (exception.GetBaseException() is SocketException)
{
//当为 socket 异常时，允许使用其它MX
firstException = exception;
}
else
{
throw;
}
}
}
//当首选服务器为列表中最后一个服务器且重试失败时将首选异常丢出.
throw firstException;
}
