What is the unique identification for emails?

c# email exchange-server uniqueidentifier
myermian picture myermian · Aug 6, 2012 · Viewed 8.1k times · Source

I'm trying to find the guaranteed unique identifier to distinguish emails from each other. Currently, I am writing an application which connects to Microsoft Exchange, however I want to be able to support other email services.

I think that the unique identifier is the EmailMessage.InternetMessageId, and that this property uses the PR_ENTRYID, except that I can't find any documentation to support this.

Do all emails have a unique identifier and is that (in Exchange) the InternetMessageId?

Answer

jmoreno picture jmoreno · Aug 6, 2012

There is no guaranteed unique id for emails, the Message-ID is about as close as you come. The best you can actually hope for is unique for the server...and even that depends upon the type of mail server and what it does.

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