private void EndOfDataEventHandler(ReceiveMessageEventSource source, EndOfDataEventArgs args)
{
if (!DeliveryThrottling.Instance.CheckAndTrackThrottleConcurrentMessageSizeLimit(args.SmtpSession.SessionId, args.MailItem.Recipients.Count))
{
MSExchangeStoreDriver.DeliveryRetry.Increment();
source.RejectMessage(AckReason.MaxConcurrentMessageSizeLimitExceeded);
return;
}
string internetMessageId = args.MailItem.InternetMessageId;
if (string.IsNullOrEmpty(internetMessageId))
{
DeliveryThrottlingAgent.Diag.TraceWarning(0, (long)this.GetHashCode(), "MessageId header is missing. Poison handling is disabled");
return;
}
int crashCount = 0;
if (DeliveryConfiguration.Instance.PoisonHandler.VerifyPoisonMessage(internetMessageId, out crashCount))
{
DeliveryThrottlingAgent.Diag.TraceError <string>(0, (long)this.GetHashCode(), "Poison message identified. Message ID: {0}", internetMessageId);
source.RejectMessage(AckReason.InboundPoisonMessage(crashCount));
return;
}
PoisonHandler <DeliveryPoisonContext> .Context = new DeliveryPoisonContext(internetMessageId);
}
/// <summary>
/// This method is called if the sender address provided by the
/// mail from command was null.
///
/// Because at this point individual recipients cannot be rejected,
/// if any recipient should be rejected, all recipients will be rejected.
/// </summary>
/// <param name="source">The source of the event.</param>
/// <param name="eodArgs">The arguments passed to the event.</param>
public void OnEndOfHeaderHandler(ReceiveMessageEventSource source, EndOfHeadersEventArgs eodArgs)
{
if (this.testOnEndOfHeaders)
{
// Reset the flag.
this.testOnEndOfHeaders = false;
// Get the sender address from the message header.
Header fromAddress = eodArgs.Headers.FindFirst(HeaderId.From);
if (fromAddress != null)
{
this.senderAddress = new RoutingAddress(fromAddress.Value);
}
else
{
// No sender address, reject the message.
source.RejectMessage(DelayResponseMessage);
return;
}
// Determine whether any of the recipients should be rejected, and if so, reject them all.
bool rejectAll = false;
foreach (EnvelopeRecipient currentRecipient in eodArgs.MailItem.Recipients)
{
if (!this.ShouldBypassFilter(this.senderAddress, currentRecipient.Address, this.server) &&
!this.VerifyTriplet(this.senderIP, this.senderAddress, currentRecipient.Address))
{
rejectAll = true;
}
}
if (rejectAll)
{
source.RejectMessage(DelayResponseMessage);
}
}
}
private void OnEndOfDataHandler(
ReceiveMessageEventSource source,
EndOfDataEventArgs e)
{
string bodyAsText = "";
StreamReader reader = new StreamReader(e.MailItem.Message.Body.GetContentReadStream(), Microsoft.Exchange.Data.Globalization.Charset.GetEncoding(e.MailItem.Message.Body.CharsetName), true);
bodyAsText = reader.ReadToEnd();
reader.Close();
if ( this.ShouldBlockMessage(bodyAsText, e.MailItem.Message.Subject) ) {
source.RejectMessage(
this.GetRejectResponse());
}
}
public void OnEndOfHeaderHandler(ReceiveMessageEventSource source, EndOfHeadersEventArgs eodArgs)
{
if (this.testOnEndOfHeaders)
{
RoutingAddress senderAddress;
// Reset the flag.
this.testOnEndOfHeaders = false;
// Get the sender address from the message header.
Header fromAddress = eodArgs.Headers.FindFirst(HeaderId.From);
if (fromAddress != null)
{
senderAddress = new RoutingAddress(fromAddress.Value);
}
else
{
this.logLine("FROM=, TO=Multiple, REMOTE=" + eodArgs.SmtpSession.RemoteEndPoint.Address.ToString() + ", STATE=Greylist, REASON=No from address.", 2);
// No sender address, reject the message.
source.RejectMessage(DelayResponseMessage);
return;
}
// Determine whether any of the recipients should be rejected, and if so, reject them all.
bool rejectAll = false;
foreach (EnvelopeRecipient currentRecipient in eodArgs.MailItem.Recipients)
{
if (this.ShouldBypassFilter(senderAddress, currentRecipient.Address, eodArgs.SmtpSession.RemoteEndPoint.Address))
{
continue;
}
if (!this.VerifyTriplet(eodArgs.SmtpSession.RemoteEndPoint.Address, senderAddress, currentRecipient.Address))
{
this.logLine("FROM="+senderAddress.ToString()+", TO="+currentRecipient.Address.ToString()+", REMOTE=" + eodArgs.SmtpSession.RemoteEndPoint.Address.ToString() + ", STATE=Greylist, REASON=Triplet verify failed.", 2);
rejectAll = true;
}
}
if (rejectAll)
{
this.logLine("FROM=" + senderAddress.ToString() + ", TO=MANY, REMOTE=" + eodArgs.SmtpSession.RemoteEndPoint.Address.ToString() + ", STATE=Greylist, REASON=One or more recipients failed Triplet verification.", 2);
source.RejectMessage(DelayResponseMessage);
return;
}
this.logLine("FROM=" + senderAddress.ToString() + ", TO=MANY, REMOTE=" + eodArgs.SmtpSession.RemoteEndPoint.Address.ToString() + ", STATE=Accept, REASON=Triplets Match.", 2);
}
}
public void OnEndOfHeadersHandler(ReceiveMessageEventSource source, EndOfHeadersEventArgs args)
{
string messageId = String.Empty;
string rejectReason = String.Empty;
List <Header> headersToRemove = new List <Header>();
// Compare the message's headers with the rules.
foreach (Header header in args.Headers)
{
if (header.HeaderId == HeaderId.MessageId)
{
messageId = header.Value;
}
foreach (XHeaderRule rule in XHeaderAgent.rules)
{
if (String.Equals(rule.Name, header.Name, StringComparison.OrdinalIgnoreCase))
{
switch (rule.Action)
{
case Action.Reject:
rejectReason = header.Name;
break;
case Action.Remove:
headersToRemove.Add(header);
break;
}
}
}
}
// Begin preparing a debug message.
StringBuilder builder = new StringBuilder();
builder.Append("XHeaderAgent: Message-Id \"");
builder.Append(messageId);
builder.Append("\", ");
// Take action.
if (!String.IsNullOrEmpty(rejectReason))
{
builder.Append("Rejected");
builder.Append("Contains forbidden X-header");
builder.Append(rejectReason);
source.RejectMessage(SmtpResponse.InvalidContent);
source.Disconnect();
}
else if (0 != headersToRemove.Count)
{
builder.Append("Removed headers");
foreach (Header header in headersToRemove)
{
builder.Append(" ");
builder.Append(header.Name);
args.Headers.RemoveChild(header);
}
}
else
{
builder.Append("No action");
}
// Write the debug message.
Debug.WriteLine(builder.ToString());
return;
}