Uniquely identifying an email, even after changes?

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Posted on by DS-15112115-0

I'm trying to use emails to track progress on tasks, and I want to be able to have an identifier that will stay constant on an email even if it's moved between folders. MessageID changes when it's moved between folders, so that won't work.

I tried using Send an HTTP Request to create an extension value on the message, and then assign a GUID value to the extension. It seemed to work, but if I try to retrieve the extension value with another "Send an HTTP request", I get a "URI path is not a valid Graph endpoint" error for a path like:

https://graph.microsoft.com/v1.0/me/messages/[messageID]/extensions/[extensionname]

Any thoughts on why this Send an HTTP Request doesn't work? Are graph endpoints *under* messages not supported? Is there a better way to uniquely identify emails even if they're moved between folders? I thought about using Internet Message ID, but I'm not sure how reliable that is.

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Building flows

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trice602 16,558 Super User 2026 Season 2 on at

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Hi,

Please review the conversationId. It remains constant in replies and forwards; and will work for you.

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⭐ If this was helpful, please like and/or mark as a verified answer to help others find this too!

Always glad to help! 💯💯💯💯💯

Tom

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DS-15112115-0 4 on at

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Thanks, Tom, but that's not exactly what I'm looking for -- I want a unique identifier for the message, and my understanding of conversationID is that it will be unique within a conversation, but the same conversationID will be applied to every message in the conversation.
trice602 16,558 Super User 2026 Season 2 on at

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Hey there!

I am following up on this post uniquely identifying an email, even after changes? in this category building flows from 11/15/2024. I know the post is a little older, but it is a common question here so wanted to take a moment and follow-up. I see there have been 2 replies and 1 likes and asking if your question has been answered. If so, please help the community out by completing one or more of the following actions! Thanks in advance!

Easy as 1-2-3 ‼️💯⭐😎🆒🙏

1) Mark a reply as a verified answer - this is essential, and it helps others with the same general question find this thread. ✅

2) You can also mark one of more replies as a verified answer. Please take a moment and give the author credit for volunteering their time. ✌️

3) Like one or more replies. Kudos always greatly appreciated! 👍

Pro tip: if you found your own solution or workaround, feel free to add a reply to your own post and mark it as the solution too! The goal is to get this thread marked with a verified answer by anyone that finds one or more replies helpful!

Again, thanks in advance for reading and responding, always glad to help! Tom 💯💯💯💯💯
trice602 16,558 Super User 2026 Season 2 on at

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If I can help with anything else please let me know or tag me in a future post, I enjoy reading and answering questions. Always glad to help! Tom 💯💯💯💯💯