Email unique id

[Harry]

Hi,
This is a developer q's.....currently when an email comes in the user
imports it to our local database. Now, if the same email is received
by three different people......how do i notify the others if one of
them has already stored the email....?

Is ther a unique email id property that i can use?

Thanks!

 

[Dmitry Streblechenko]

PR_INTERNET_MESSAGE_ID MAPI property shoudl do the trick.
You can access it through MailItem.PropertyAccessor in Outlook 2007.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-

 

[Harry]

Thanks a lot Dimitry for your reply, is the above property guaranteed
to remain unique in all cases..... if the mail item has been moved,
copied etc?


Thank you!

 

[Harry]

Also, this just occured to me.....since the prop says
internet_header .... wht abt messages sent in intra-organizational
Exchange emails not the ones sent over the internet??

Again, thank you for your time and patience!!

 

[Dmitry Streblechenko]

The property should stay unchanged.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
Thanks a lot Dimitry for your reply, is the above property guaranteed
to remain unique in all cases..... if the mail item has been moved,
copied etc?


Thank you!

 

[Dmitry Streblechenko]

Exchange 2007 always creates that property. Not sure about Exchange 2003.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
Also, this just occured to me.....since the prop says
internet_header .... wht abt messages sent in intra-organizational
Exchange emails not the ones sent over the internet??

Again, thank you for your time and patience!!

 

[Ken Slovak - [MVP - Outlook]]

Exchange 2003 creates it for internal emails also.

 

[Jarrod]

For mails in "Sent Items", this property does not seem to be present when
viewed using OutlookSpy.

I'm currently testing on Exchange 2007 with Outlook 2007. Outlook's
Send/Receive "Send immediately when connected" checkbox is enabled.

Is there any setting on Exchange 2007 that needs to be enabled to make it
set this property accordingly?

From this KB article: http://support.microsoft.com/kb/924213
It seems that this property exists for Sent Items with Exchange 2003, with
some caveats.

 

[Dmitry Streblechenko]

Are you using a cached or online store?
Can you try to uncheck the "Use cached mode" checkbox in the Exchange
account properties dialog?

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-

 

[Jarrod]

Ah... I see, thanks.

Didn't realise there was a "Use Cached Exchange Mode" option.

Btw, looks like cached mode is the default for Exchange deployments? Can a
organisation actually lockdown this option to non-cached so that this
technique of uniquely identifying emails upon sending becomes feasible?

 

[Dmitry Streblechenko]

That woudl be an overkill. Why not try to retrieve that property, an if it
is not available, reopen the message in the online mode:
http://support.microsoft.com/kb/834496

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-

 

[Jarrod]

Hmm, good KB article, thanks.

However, based on scenario 4 in this KB article:
http://support.microsoft.com/default.aspx/kb/924213

It seems to indicate that the retrieved message id using this method would
be different from the actual mail that was already sent out while in cached
mode?

 

[Dmitry Streblechenko]

But you are trying to solve scenario (3).
If PR_INTERNET_MESSAGE_ID property is already present, you would not need to
open the message in the online mode to begin with.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-