Safe Attachments policy: This policy allows you to specify how to handle email attachments that might contain malware. You can create a custom policy for Mailbox1 and set the action to Do not scan attachments. This will ensure that incoming email is not filtered for Mailbox1. You can also enable the Redirect attachment option to send a copy of the original attachment to another mailbox for analysis1.

Anti-phishing policy: This policy helps you protect your organization from impersonation and spoofing attacks. You can create a default policy for all other mailboxes in the subscription and enable the following features: Impersonation protection, Spoof intelligence, and Domain authentication. These features will help you detect and block emails that try to impersonate your users, domains, or trusted senders2.