I am trying to reconstitute Emails that have been received through the named trigger. However, I have been unable to place attached inline images that had been placed in the body via CIDs since those do not seem to be exposed as attributes of the attachments. Is there a way to get the Content-IDs for the attachments of Emails received via the trigger?

The trigger should return an array of GraphClientReceiveMessage objects which each has an Attachments property with an array of GraphClientReceiveFileAttachment (same as the attachment object from the underlying Graph API). Each attachment has an Is Inline property which should be true for all inline attachments. But while you do get the file name from this object, the actual CID is not available. For that, the only way available seems to be parsing the body returned from the trigger. UPDATE: Since the trigger doesn't return the Content ID, one work around would be to call the Graph REST API directly to fetch the complete object instead. Also, please feel free to raise a feature request to return all types of file attachments instead of the just the base type .

How to get CIDs from "When new mail arrives (V3)" trigger

Accepted answer

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-09-25T06:35:37.633+00:00

The trigger should return an array of GraphClientReceiveMessage objects which each has an Attachments property with an array of GraphClientReceiveFileAttachment (same as the attachment object from the underlying Graph API). Each attachment has an Is Inline property which should be true for all inline attachments.

But while you do get the file name from this object, the actual CID is not available. For that, the only way available seems to be parsing the body returned from the trigger.

UPDATE: Since the trigger doesn't return the Content ID, one work around would be to call the Graph REST API directly to fetch the complete object instead.

Also, please feel free to raise a feature request to return all types of file attachments instead of the just the base type.
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Cornelius Schreuer 67 Reputation points

2020-09-25T07:39:53.703+00:00

Thank you, but how would you parse it from the body? The MIME headers containing the CIDs are not included in the received body and I do not see how I could map the cid in the image tag's src attribute to the appropriate attachment.

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-09-25T09:12:10.953+00:00

I'm not familiar with the CID URI format in outlook emails, but after a couple of tests, it looks like the filename is the first part of them. The format is something like cid:<filename>@<string>. So, I believe you could fetch the attachment using the filename which is the name property in the trigger output.

Cornelius Schreuer 67 Reputation points

2020-09-25T09:23:58.16+00:00

That format is a common practice, but unfortunately, by no means an ensured standard. These ids are not generated by outlook, but by whatever tool is used in creating the message and therefore have to be treated as random strings.

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-09-25T09:31:31.66+00:00

Apologies if I am missing something related to how they are generated but the first part of the CID seems to match the name property of each attachment. Would that not be enough to relate the two?

Cornelius Schreuer 67 Reputation points

2020-09-25T09:43:01.343+00:00

What I tried to say is that they in fact do not necessarily match, depending on how the email was originally created. Here is a real life example out of a customer's mail:

src="cid:_1_21AB982821AB95BC00450D32C12585C3"

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-09-25T10:05:50.007+00:00

Understood. Could you share what the attachment object looks like for such an email? Or perhaps just the name property?

Cornelius Schreuer 67 Reputation points

2020-09-25T10:32:40.57+00:00

{ "t:AttachmentId": [ { "$": { "Id": "AQMkADAwATM0MDAAMS1hYjlmLTk0ZTQtMDACLTAwCgBGAAADbmKK810Z20KdEjGQE8J8IwcAoGPj4mXZtkmJhwFSUJKcYQAAAgEMAAAAoGPj4mXZtkmJhwFSUJKcYQADozpS4AAAAAESABAA5Hvq834sLABGhoqJHw6Ie/E=" } } ], "t:Name": [ "ATT00001.gif" ], "t:ContentType": [ "image/gif" ], "t:ContentId": [ "_1_232459482324570800450D32C12585C3" ], "t:Size": [ "1897" ], "t:LastModifiedTime": [ "2020-08-13T12:36:30" ], "t:IsInline": [ "true" ], "t:IsContactPhoto": [ "false" ] }

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-09-25T10:41:56.187+00:00

Looks like you have a ContentId property that you could use. Is this object from the logic app trigger?

Cornelius Schreuer 67 Reputation points

2020-09-25T10:46:08.563+00:00

This is the attachment data from the exchange server. The data provided by the trigger mirrors all attributes with the unfortunate exception of the contentId

Pramod Valavala 20,656 Reputation points Microsoft Employee

2020-10-06T15:53:32.413+00:00

Apologies for not getting back sooner. I've updated my answer with a workaround and a link to where you can create a feature request to include these properties.
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How to get CIDs from "When new mail arrives (V3)" trigger

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