How to block outgoing emails with attachments larger than 25 MB

How can you block users from sending emails with attachments larger than 25 MB to avoid exceeding Gmail limits?

• Admin console
• Settings for Gmail

You can accomplish this behavior on your domain by setting up a compliance rule. Follow the instructions below for set up:

1. Log in to your Admin console.
2. On the main menu select Apps > Google Workspace > Gmail > Compliance.
3. Scroll down to Content compliance.
4. Click Configure or Add a new rule.
5. Name your Attachment compliance rule.
   • Email messages to affect: Outbound, Internal sending.
   • Add expressions that describe the content you want to search for in each message.
   • If any of the following match the message:
     1. Expressions > Add.
     2. On the first drop down menu select Message Size.
     3. On the message site amount type: 25.
     4. Click Save.
   • If the above expressions match, do the following:
     1. Select Reject message.
     2. Type the rejection message.
6. Click Save.