What are the signs of a compromised sending account?
Unusual activity: sending you didn't initiate, recipients you don't know, and volume inconsistent with normal use. Check sent folder and activity logs.
External reports: recipients reporting spam from your address, bounce notifications for messages you didn't send, and blocked or blacklisted notifications.
Account changes: password changed without your action, unfamiliar recovery information, new forwarding rules, and connected applications you didn't authorize.
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