Enhance phishing and malware protection

As a G Suite administrator, you can protect incoming mail against phishing and harmful software (malware). You can also choose what action to take based on the type of threat detected. For example, you might choose to move suspicious content to your Spam folder, or choose to leave it in your inbox with a warning. All the security settings can be tailored for different users and teams using organizational units.

Note: Gmail already displays warnings, and moves emails known to be untrustworthy to spam. Using the settings in this article can help you capture additional unwanted or harmful emails.

Advanced security settings

  • Attachments—Protection against suspicious attachments and scripts from untrusted senders. Includes protection against attachments types that are uncommon for your domain—these can be used to spread malware.

  • Links and external images—Identify links behind short URLs, scan linked images for malicious content, and display a warning when you click links to untrusted domains.

  • Spoofing and authentication—Protection against spoofing a domain name, employee names, email pretending to be from your your domain, and unauthenticated email from any domain. Unauthenticated emails display a question mark next to the sender’s name. Spoofing protection can be turned on for private groups, or for all groups.

  With advanced settings, you can:

  • Automatically turn on and apply future recommended settings. This ensures maximum protection for email and attachments for your domain.

  • Provide the strongest level of protection for a domain or organizational unit by turning on all security options.

  • Customize security settings by checking only the options you want to turn on. Unchecking all options turns off all advanced security settings for the domain or organizational unit.

  • Specify an action for each security option you turn on. If you don’t select an action, the default action is applied to the security option.

Notes

  • Other spam settings—These advanced security features work independently of other spam settings you might have previously turned on. For example, even if you've listed a domain as a safe sender in spam settings, the enhanced security features are still applied.

  • Quarantine action—When you select the Quarantine option for any of the advanced security settings, the quarantine you select applies only to incoming messages. This is true even if the quarantine you select specifies actions to take on outgoing messages.

  • Warning banners—Warning banners (yellow box) appear only for Google Gmail user interfaces (web and mobile). Third-party apps do not display a warning banner.

Apply advanced security settings

Note: The Quarantine action for all advanced security settings is in beta. The No action (default) action is deprecated and and soon will be unavailable. 

Turn on attachment protection

Google scans all messages to protect against malware, whether or not attachment security settings are turned on. Enforce extra, specific actions for certain types of files with the settings in this section. Both settings protect against senders with no prior Gmail history or with a low sender reputation.

  1. Sign in to your Google Admin console.

    Sign in using your administrator account (does not end in @gmail.com).

  2. From the Admin console Home page, go to Appsand thenG Suiteand thenGmail.
  3. In the Safety section, scroll to Attachments.
  4. Select the setting and action you want to apply to incoming emails. (Details below)
Attachments settings Actions

Protect against encrypted attachments from untrusted senders
Protect against attackers who use encrypted attachments, which can't be scanned for malware. 

  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Protect against attachment with scripts from untrusted senders
Protect against documents that contain malicious scripts that can harm your devices.     

  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Protect against anomalous attachment types in emails (beta)

Protect against attachment file types that are uncommon for your domain. Uncommon and archaic file types can be used to spread malware.

You can whitelist uncommon file types that you approve and that are regularly sent to your domain. Messages with whitelisted file attachments are delivered to the recipient's inbox.

Enter file extensions in the Whitelist the following uncommon filetypes field without a preceding period and separated by commas. For example:  arj, iqy, par

  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Apply future recommended settings automatically

When we add new, recommended security settings for attachments, those settings are turned on by default.

Turn on links and external images protection

 
  1. Sign in to your Google Admin console.

    Sign in using your administrator account (does not end in @gmail.com).

  2. From the Admin console Home page, go to Appsand thenG Suiteand thenGmail.
  3. In the Safety section, scroll to Links and external images.  
  4. Select the desired security settings. (Details below)
Links and external images settings  
Identify links behind shortened URLs Allow discovery of harmful links hidden behind shortened URLs. 

Scan linked images

Allow scanning of images referenced by links to find hidden malicious content.

Show warning prompt for any click on links to untrusted domains 
Not available for IMAP/POP email client

Gmail displays a warning when you click a link to untrusted domains in any email message. If this feature isn't on, warnings only appear for clicks to untrusted domains from suspicious emails.
Apply future recommended settings automatically When we add new, recommended security settings for links and external images, those settings are turned on by default.

Turn on spoofing and authentication protection

  1. Sign in to your Google Admin console.

    Sign in using your administrator account (does not end in @gmail.com).

  2. From the Admin console Home page, go to Appsand thenG Suiteand thenGmail.
  3. In the Safety section, scroll to Spoofing and authentication.
  4. Select the settings and actions you want to apply to incoming emails. See details below.
     
Spoofing and authentication settings Actions
Protect against domain spoofing based on similar domain names
Protect against incoming messages from domains that appear visually similar to your company's domains or domain aliases. 
  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Protect against spoofing of employee names
Protect against messages where the sender's name is a name in your G Suite directory, but the email isn't from your company domain or domain aliases.

Important: For this setting to work correctly, Enable contact sharing and Show all email addresses must be selected in directory sharing settings. To verify, go to  G  Suite > Directory > Directory settingsSharing settings and review the Contact sharing section. 

  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Protect against inbound emails spoofing your domain
Protect against potential Business Email Compromise (BEC) messages not authenticated (with SPF or DKIM), pretending to be from your domain. 
  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Protect against any unauthenticated emails
Protect against any message not authenticated (with SPF or DKIM) by any domain. 
  • Keep email in inbox and show warning (Default)
  • Move email to spam

  • Quarantine

Protect Groups from inbound emails spoofing your domain (beta)

Protect your Google Groups from inbound emails spoofing your domain. You can apply this setting to all groups or to private groups only.

  • Keep email in inbox and show warning (Default)

  • Move email to spam

  • Quarantine

Apply future recommended settings automatically

When we add new, recommended security settings for spoofing and authentication, those settings are turned on by default.

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