When sharing a PDF from adobe the email type is set to plain text not HTML

Question

Copilot said:We have a user who is attempting to share PDFs directly from Adobe Acrobat. When using the share option, the email opens in Plain Text format instead of HTML, which is preventing the user's email signature from being applied correctly.I have already tried the following fix:I created a new key at:HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\DC\FeatureLockDownI then created a DWORD value called bSendMailShareRedirection and set it to 0.Unfortunately, this did not resolve the issue, as emails continued to open in Plain Text format rather than HTML.Has anyone come across this before or knows of a permanent fix?

Anand Sri Bhattacharya · Answer

Hello @funny_videographer33e7,I hope you are doing well, and thanks for reaching out. We're sorry for the trouble you had.Could you please share more details about the issue? Which Adobe product is affected: A) Acrobat Reader, B) Acrobat Standard, C) Acrobat ProWhat version/build of Acrobat are you using (Menu (Windows) | Acrobat (Mac) Help > About Acrobat), and is this on Windows or macOS?Which email client is being launched when you use Share: A) Outlook (classic), B) New Outlook for Windows, C) Outlook for Mac, or D) another email application?Please ensure you have the latest version of Acrobat installed on the machine: 26.001.21789, Out of cycle update, Aug 11, 2026. Check for any pending updates by navigating to Menu > Help> Check for Updates. Install the updates, restart the app and the machine, and try again. Verify the email application Acrobat is using.Open the PDF and select Share in the upper-right corner, then select Share link via email and choose the preferred email account. If more than one email application is installed, Adobe says to set the preferred application in Windows system settings and restart Acrobat before testing again. Check this article for more details: https://adobe.ly/4wN5HnoAlso, the registry value you tried does not control HTML or Plain Text formatting. Adobe documents bSendMailShareRedirection only as a switch for the email-button workflow:0 or not present: open the Unified Share pane.1: Make the email icon automatically attach the PDF to a new email.Adobe lists this as an HKLM FeatureLockDown preference that requires administrative configuration, not as the HKCU value used in the question. More importantly, Adobe’s documentation does not state that this preference controls the Outlook message format or signature insertion. Therefore, setting it to 0 is not an officially documented fix for this Plain Text issue. Check this article for more information: https://adobe.ly/46ltHTKIf HTML composition is required, use Adobe’s Outlook-initiated workflow.Start a new message in Outlook and ensure it is being composed as HTML. For the classic Acrobat Outlook plug-in, Adobe documents the path as New message > Message > Attach instant file link in the Adobe Acrobat group. Adobe specifically states that the plug-in requires HTML rather than RTF and provides control over the email’s format and content. Check this article for more details: https://adobe.ly/4wLPMWeI hope this helps, and please reach out if you need any assistance.Regards,Anand Sri.

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