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This issue appears to be fixed in version:
Microsoft Outlook Version: 1.2026.105.100
Client Version: 20260109002.06
WebView2 Version: 143.0.3650.139
This was the behavior reported:
Newly created .eml files, when opened will no longer save to the draft folder. The latest update of the new Outlook PWA app generates a "This message can't be saved right now. Please try again later." error message when saving newly created .eml files. It will always produce this error no matter how long you wait.
Until very recently, it's been possible to generate an .eml file with the "X-Unsent: 1" header and it would open the .eml file and allow you to save it to draft. This is very useful when programmatically generating email templates. This has been working for quite some time, then in September it started failing with the above message.
This problem seems to be happening because the Message-ID: <***.outlook.com> has not yet been assigned. In prior versions of Outlook, the Message-ID if missing would be assigned when saving to Draft, this is no longer the behavior.
It's unclear if this is a bug (regression) or by design.
Does anyone know of a workaround or alternative way to programmatically generate .eml files that outlook will open and save to draft?
Using New Outlook on Windows for personal email, calendar, and contact management
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We are having the same issue. We generate a .eml file with the "X-Unsent: 1" header. When we open it, it is no longer possible to save it to draft.
Updated original post to reflect the fix I observed in version:
Microsoft Outlook Version: 1.2026.105.100
Client Version: 20260109002.06
WebView2 Version: 143.0.3650.139
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Hi BradB,
Thank you for posting your question in the Microsoft Q&A Forum. I understand that you're unable to save your draft email. Please try using another platform; if the draft saves there, it should automatically sync with your Outlook PWA. If you're concerned about the message-ID, consider using Classic Outlook, which you can download from here: Install or reinstall classic Outlook on a Windows PC. Alternatively, try using Outlook Web App (OWA) to see if your draft saves properly instead of using PWA.
The initial response might not address the problem. So, if your problem persists or you need any assistance, feel free to ask me by clicking "Add Comment". Thanks for your effort.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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Best regards.
Hi BradB,
I just wanted to check in and see if the steps worked for you. If everything is set, it would be greatly appreciated if you could mark the answer as Accepted. This helps others facing similar issues and keeps things organized.
If you need any further assistance, don’t hesitate to reach out!
No this does not work. Apparently, this functionality has been deprecated. I have found no way to open a new .eml file template and save it as a draft message. I've tried new outlook, classic outlook, the update of new outlook with support for .oft files. The outlook service always generates the error "This message can't be saved right now. Please try again later." The "X-Unsent: 1" header used to allow this, now it doesn't. The only solution I've found is to create a new draft mail in new outlook, save it to .eml and the copy the Message-ID into the .eml file I want to use and reopen it. What a hack. Outlook (service and client) should recognize the X-Unsent: 1 header and assign a new Message-ID if one does not exist.
Hi BradB,
Thank you for your response. Currently, Outlook requires a valid Message-ID in .eml files to save them as drafts. The "X-Unsent: 1" header alone no longer triggers this automatically. Creating a draft first to obtain a Message-ID and then adding it to your .eml file is a practical approach.
If you need assistance with this process or have further questions, feel free to ask.