Attachment Issues

How to Fix Adobe Acrobat Email Attachment Problems with Outlook on macOS

Nimra MalikNimra Malik Oct 28, 2026 869 views

Question details

The user is unable to send online PDFs directly as Outlook attachments from Adobe Acrobat on macOS.

How to Fix Adobe Acrobat Email Attachment Problems with Outlook on macOS
Product
Adobe Acrobat 2018
Device & OS
macOS High Sierra
Scenario
Attempting to email an online PDF directly via the 'Attach to Email' feature in Acrobat using Outlook on a Mac.
Observed behavior
Acrobat fails to send the PDF as an email attachment unless the user manually saves the file to their local drive first.
Before you start

Ensure that you have your Apple Mail and Microsoft Outlook account credentials handy, and save any open documents before restarting your Mac.

Solution 1Recommended

Update Adobe Acrobat and Set Outlook as the Default Mail Client

Updating the software and ensuring macOS recognizes Outlook as your default email client often resolves the 'Attach to Email' failure.

Acrobat relies on the macOS system defaults to trigger the correct email application. If the Apple Mail app is still configured as the system default, the 'Attach to Email' feature may fail to communicate with Outlook properly.

1
Check for Acrobat updates

Open Adobe Acrobat on your Mac. Navigate to the 'Help' menu at the top of the screen and select 'Check for Updates'. Install any available patches.

2
Configure the default mail app

Open the built-in 'Mail' app on your Mac. Go to 'Mail' > 'Preferences' from the top menu bar, and click the 'General' tab.

3
Select Microsoft Outlook

Find the 'Default email reader' dropdown menu and change it from 'Mail' to 'Microsoft Outlook'.

4
Restart your Mac

Restart your computer to apply the system changes, then open Acrobat and try sending the PDF again.

Update Adobe Acrobat and Set Outlook as the Default Mail Client
Version Compatibility: Make sure that both your macOS version (High Sierra) and Microsoft Outlook are fully updated to avoid underlying compatibility conflicts.
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Frequently Asked Questions

Why won't Adobe Acrobat attach my PDF to an Outlook email on Mac?

This usually happens due to outdated software versions, integration bugs between Acrobat and Outlook, or if the Apple Mail app is still set as the system's default email reader instead of Outlook.

How do I make Microsoft Outlook my default email client on macOS?

Open the built-in Apple 'Mail' app, go to 'Mail' > 'Preferences', click the 'General' tab, and change the 'Default email reader' dropdown from Mail to Microsoft Outlook.

Can I send an online PDF without saving it first?

Yes, if the 'Attach to Email' feature is functioning correctly, Acrobat downloads a temporary copy and attaches it. If it fails, updating your software or using a workaround (like saving locally via File > Save As) is necessary.