I’ve Been ATO’d! What to Do After an Account Takeover

Account Takeover (ATO) involves unauthorized access to an email account by a bad actor, often to exploit the account's reputation for sending spam or phishing emails. This can occur through exposed API keys or weaknesses in email security practices. Once compromised, it is crucial to secure the account, identify the vulnerability, and implement preventive measures like IP access management and API key restrictions. Although an ATO can temporarily affect an account's reputation, it can be restored by adjusting sending behavior and focusing on legitimate email delivery. Maintaining vigilance and adopting best practices in email security can mitigate future risks. Twilio SendGrid offers guidance and resources to help businesses enhance their email programs and prevent ATOs.