Event Sink Event Choices - Microsoft Exchange

I should probably add that I need high performance. This sink will process
about 10k messages a day with 15% growth per month.

"David A. Coursey" wrote:

> I have read all the docs, but I am a little fuzzy on what event I should
> choose. I think I should use either OnArrival or OnMessageSubmission. I
> want to be able to access the SMTP envelope and the message with attachments
> before the message is written to disk.
>
> I started writing using OnMessageSubmission, but I can't find how to access
> the message and attachments. I see multiple examples online on how to use
> OnArrival, but I was working under the assumption that OnMessageSubmission
> would better suit my needs.
>
> Thanks for looking
> dave

What language are you programming in if your talking high volume this is
always going to be a determining factor if you haven't already you should
have read the following in the doco regard VB

" The event dispatcher thread executes in the multithreaded apartment (MTA)
of the IIS service process. If an event sink COM class is registered to
execute only in a single-threaded apartment (STA), the COM runtime will
automatically create the necessary STA in the process and will serialize
calls to the object in the standard way. If the in-process class is
registered as supporting MTA and STA or MTA only, no marshalling is
required. If the sink resides in a separate apartment, all interfaces must
be marshalled across the apartment boundaries. This marshalling can degrade
performance and may be a poor option for high-volume SMTP and NNTP services.
Sinks written with scripting languages and Microsoft® Visual Basic® run in
STAs"



This one paragraph is very telling in regards to writing a sink that is
going to perform well under heavy load even if your not using VB making sure
your sink runs inprocess and uses a minium number of Interfaces etc.



In regards to what's best to use for a high volume sink there is overhead
associated with onarrival "The major drawback is that the CDO interface adds
significant overhead and is synchronous. The CDO_OnArrival event is most
appropriate for sinks that are run on very few messages. The
OnSubmission/OnArrival event is the only event that offers a CDO interface
and the ability to write event sinks in Visual Basic or VBScript. The
OnSubmission event is the place to add new recipients to the message. " from
http://msdn.microsoft.com/library/de...d1b7270dac.asp



To access the message in onsubmission sink you need to use the MailMsg
object see
http://msdn.microsoft.com/library/de...760c05b320.asp
someone posted a sample a while back using C# have a look at

http://groups.google.com.au/group/mi...f38947fb099e52



Cheers

Glen





"David A. Coursey" <dcoursey@ILOVESPAM_gmail.com> wrote in message
news:9B552827-A8D5-405C-A83C-90D8F5436739@microsoft.com...
>I should probably add that I need high performance. This sink will process
> about 10k messages a day with 15% growth per month.
>
> "David A. Coursey" wrote:
>
>> I have read all the docs, but I am a little fuzzy on what event I should
>> choose. I think I should use either OnArrival or OnMessageSubmission.
>> I
>> want to be able to access the SMTP envelope and the message with
>> attachments
>> before the message is written to disk.
>>
>> I started writing using OnMessageSubmission, but I can't find how to
>> access
>> the message and attachments. I see multiple examples online on how to
>> use
>> OnArrival, but I was working under the assumption that
>> OnMessageSubmission
>> would better suit my needs.
>>
>> Thanks for looking
>> dave

Yeah, I had already read those articles, and pretty much guessed that I would
stick with OnTransportSubmission. I just couldn't find how to access the
message. My fears were that you were going to post saying that I can't
access the message. I'm writing this in C# 2.0

For whatever reason, when I searched google groups I never found that
example you posted. Once again you come to the rescue!

I'm going to document this pretty heavily once I'm finished. I don't have a
blog, but maybe I'll write something for Outlook Exchange.

Thanks,
dave
"Glen Scales [MVP]" wrote:

> What language are you programming in if your talking high volume this is
> always going to be a determining factor if you haven't already you should
> have read the following in the doco regard VB
>
> " The event dispatcher thread executes in the multithreaded apartment (MTA)
> of the IIS service process. If an event sink COM class is registered to
> execute only in a single-threaded apartment (STA), the COM runtime will
> automatically create the necessary STA in the process and will serialize
> calls to the object in the standard way. If the in-process class is
> registered as supporting MTA and STA or MTA only, no marshalling is
> required. If the sink resides in a separate apartment, all interfaces must
> be marshalled across the apartment boundaries. This marshalling can degrade
> performance and may be a poor option for high-volume SMTP and NNTP services.
> Sinks written with scripting languages and Microsoft® Visual Basic® run in
> STAs"
>
>
>
> This one paragraph is very telling in regards to writing a sink that is
> going to perform well under heavy load even if your not using VB making sure
> your sink runs inprocess and uses a minium number of Interfaces etc.
>
>
>
> In regards to what's best to use for a high volume sink there is overhead
> associated with onarrival "The major drawback is that the CDO interface adds
> significant overhead and is synchronous. The CDO_OnArrival event is most
> appropriate for sinks that are run on very few messages. The
> OnSubmission/OnArrival event is the only event that offers a CDO interface
> and the ability to write event sinks in Visual Basic or VBScript. The
> OnSubmission event is the place to add new recipients to the message. " from
> http://msdn.microsoft.com/library/de...d1b7270dac.asp
>
>
>
> To access the message in onsubmission sink you need to use the MailMsg
> object see
> http://msdn.microsoft.com/library/de...760c05b320.asp
> someone posted a sample a while back using C# have a look at
>
> http://groups.google.com.au/group/mi...f38947fb099e52
>
>
>
> Cheers
>
> Glen
>
>
>
>
>
> "David A. Coursey" <dcoursey@ILOVESPAM_gmail.com> wrote in message
> news:9B552827-A8D5-405C-A83C-90D8F5436739@microsoft.com...
> >I should probably add that I need high performance. This sink will process
> > about 10k messages a day with 15% growth per month.
> >
> > "David A. Coursey" wrote:
> >
> >> I have read all the docs, but I am a little fuzzy on what event I should
> >> choose. I think I should use either OnArrival or OnMessageSubmission.
> >> I
> >> want to be able to access the SMTP envelope and the message with
> >> attachments
> >> before the message is written to disk.
> >>
> >> I started writing using OnMessageSubmission, but I can't find how to
> >> access
> >> the message and attachments. I see multiple examples online on how to
> >> use
> >> OnArrival, but I was working under the assumption that
> >> OnMessageSubmission
> >> would better suit my needs.
> >>
> >> Thanks for looking
> >> dave
>
>
>

Ok, I am officially getting my ass handed to me. I can access the messages
properties, but I just can't get MailMsg.ReadContent to work. Any ideas on
what I'm missing?


private void ProcessMail()
{
uint size = message.SizeHint;
uint outSize = 0;
IntPtr ptr = new IntPtr();

try
{
IMailMsgNotify notify = (IMailMsgNotify)new object(); //<--This is where
I'm getting confused.
//There is oviously no constructor, and I have no idea how to use
IMailMsgNotify
notify.Notify(1);
message.MailMsg.ReadContent(0, size, out outSize, ptr, notify);

TextLog.LogEvent(outSize.ToString() + " bytes read.", dt);
}
catch (Exception ex)
{
TextLog.LogError(ex.Message, dt);
}
}