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in the future, to find the best place to post your message, use the list here, https://community.adobe.com/
p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.
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Hello!
I hope you are doing well, and thanks for reaching out.
Could you please share more details about the issue? Are you on a Windows machine or a Mac, and what is the version installed?
Do you get this error message while sending all the PDFs as an email, or is it with one specific PDF? Please ensure you have the latest version of Acrobat Reader installed on the machine: 25.001.20474 (Win) | 25.001.20476 (Mac), Apr 28, 2025. Check for any pending updates from the Menu > help > check for updates, install the updates, restart the app and the machine, and try again. For more information, see this: https://adobe.ly/4d0HlOC
Make sure the operating system and Office Suite, including Outlook, are updated to the latest version.
Open Windows Settings → Apps → Default Apps
Under Email, select Outlook
Restart Adobe Reader and try again
Adobe Reader and Outlook must both be either 32-bit or 64-bit
If they mismatch, email sending may fail
To check: Open each app > go to Help > About (for Adobe) or File > Office Account > About Outlook
Right-click on both Adobe Reader and Outlook icons → Run as Administrator
Then try sending the PDF again
See this article to know more about sending PDFs as an email: https://adobe.ly/44URjix
Let us know how it goes.
Thanks,
Anand Sri.
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