Enable Warnings for Unintended Email Replies
Have a warning show up when users reply to an unfamiliar email address.
In the Admin console at https://admin.google.com, click the Apps icon.
Select Google Workspace.
Click Gmail. Make sure not to check the box to the left; just click the service.
Select Compliance.
Under Organizational Units, select the OU with the users whose settings you want to update. The same updates will apply to all sub-OUs under the OU you choose.
By default, if you don’t select an OU, you will add your setting to the top OU, named after your domain. This way, you will apply changes to all users in your account.
You can search for an OU to find it faster if you have a large OU structure.
Find the Secure transport (TLS) compliance setting on this page and click the CONFIGURE button to the right.
If you don’t see the CONFIGURE button, click ADD ANOTHER RULE instead.
First, give the setting a short description on top.
Then under 1. Email messages to affect; check the box for each type of email you’d like to use TLS with. This setting can affect all incoming mail, outgoing mail, and outgoing mail requiring TLS via another setting.
Next under 2. Use TLS for secure transport when corresponding with these domains/email addresses; create a list and add domains/email addresses.
Click Use existing list if you already have a list. If not, click Create or edit list.
Clicking Create or edit list takes you to the Manage address lists section.
You can Edit or Delete the existing rule or click ADD ADDRESS LIST to add a new list.
Start by naming the list.
Then add the email addresses or domains that you want to add to the list. If you trust the sender, disable the Authentication required button, or you may end up actually rejecting their messages due to this setting.
Click BULK ADD ADDRESSES to add many addresses at once or click ADD ADDRESS to add a new address.
When you’re ready, click SAVE. Then go back to the TLS Compliance setting.
At the TLS Compliance setting, under 2. Use TLS for secure transport when corresponding with these domains/email addresses; click Use existing list.
Then check the box to the left of any list you want to add to the setting.
Optionally, under 3. you may want to require a CA-signed certificate when delivering to anyone on the list. This means that their email server must present a certificate signed by a Certificate Authority that Google trusts.
If you’re unsure if they have one, it’s probably best not to enable this setting. Click Test TLS connection, and if you get an error as we did above, you can notify them to let them know there’s an issue with their certificate.
In such a case, uncheck the Require CA-signed certificate box and click SAVE.
Now you can see your setting listed in the Attachment compliance section. You can Edit it, Disable it (turn off temporarily), Delete (completely remove, no restore option) or ADD ANOTHER RULE.
It may take up to 24 hours before the changes kick in.
Have a warning show up when users reply to an unfamiliar email address.
Add enhanced scanning for suspicious content in Gmail for better security.
Enforce a secure (TLS) connection with encryption for emails to and from specific domains.
Set up an alternate secure route when the TLS compliance setting above fails to apply.
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