Azure Logic Apps
An Azure service that automates the access and use of data across clouds without writing code.
3,470 questions
Attachment file size issue in Send an email (V2) activity in Azure logic app.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 77%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETN%3C/text%3E%3C/svg%3E)
Thinh Nguyen
0
Reputation points
I have searched and come across multiple questions like this, but I haven’t found a clear answer.
Currently, I'm creating a Logic App that queries logs, creates a CSV table, and then sends an email with the data as a CSV file attachment (around 5MB). The first run succeeds, but after some time, it returns a 500 Internal Server Error. When I remove and re-add the Send an Email (V2) action, it starts working again.
In other threads, the common response is that there's a 1MB limitation on attachment file size. However, based on the official documentation for Outlook Office 365 - Send an Email (V2), the 1MB limit seems to apply only to images in the email body—not to file attachments. I haven’t found any documented limitations that specifically apply to file attachments.
My questions are:
- Is there any official documentation or confirmation regarding file attachment size limits for the Send an Email (V2) action?
- If the 1MB limit mentioned in other answers applies to attachments, how was my workflow able to run successfully with a ~5MB file? The actual behavior contradicts the answers I've seen, which makes the issue inconsistent and hard to troubleshoot.
Azure Logic Apps
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(57.599999999999994, 5%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPK%3C/text%3E%3C/svg%3E)
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff2025-04-29T21:55:04.99+00:00 Hello @ Thinh Nguyen,
Could you please me the screenshot of the send an email action with configuration.
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Thinh Nguyen 0 Reputation points
2025-04-30T09:56:06.4933333+00:00 Hi @Praveen Kumar Gudipudi , I can't share the full email action configuration. However, it's simply a Send an Email (V2) action with an attachment. The
contentBytesfield is set to the output of the Create CSV table action, like this:body('Create_CSV_table'). I've updated my original question because it was somehow duplicated - the document one.I really need this email to be sent consistently, not by uploading the file to SharePoint or using a similar workaround. From my point of view, sending an email with just a 5–10 MB attachment should be doable, and it would be much more convenient. -
Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff
2025-05-01T11:49:33.8466667+00:00 Hello @ Thinh Nguyen,
Are you configuring same as below image:
please configure same as above screenshot. if you already following same configuration, please let us know.
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Thinh Nguyen 0 Reputation points
2025-05-01T14:42:53.95+00:00 Hi @Praveen Kumar Gudipudi , yes, I have configured it simply like the above.
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Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff
2025-05-01T14:54:30.9266667+00:00 Hello @ Thinh Nguyen,
Could you try configuring the retry policy and check again since the issue is only intermittent?
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Thinh Nguyen 0 Reputation points
2025-05-01T15:24:02.7666667+00:00 Hi @Praveen Kumar Gudipudi , thank you for your response. I will try it next Monday. In the meantime, may I ask if there is any documentation regarding the 1MB attachment limitation?
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Praveen Kumar Gudipudi 170 Reputation points Microsoft External Staff
2025-05-02T18:32:11.2666667+00:00 Hello @ Thinh Nguyen,
We have a size limit of 1MB per data uri for inline embedded images, i.e. the image cannot be more than 1MB after base64 encoding. This only applies to embedded images inside of the mail body. Bear in mind the size of an image after being converted to a base64 string increases. Depending on the image compression, format, and other characteristics it can increase anywhere between 25% to 50%. For instance, an image of more than 700KB will after being converted to a base 64 string likely exceed the 1MB limit stated above.
https://learn.microsoft.com/en-us/connectors/office365/#working-with-attachments
But there is no file attachment limitation mention. so, you can send 5 MB size csv file.
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