Which policy does Marketo enforce regarding unsolicited emails?

Marketo enforces a policy of zero tolerance for unsolicited commercial or bulk emails. This strict stance reflects the company's commitment to maintaining a high standard of email marketing practices and ensuring compliance with legal regulations, such as the CAN-SPAM Act and GDPR. By emphasizing this policy, Marketo protects its reputation and the integrity of its platform, while also ensuring that marketers maintain ethical communication with recipients. This approach not only fosters trust between brands and their customers but also helps to minimize spam complaints and enhances deliverability rates for legitimate marketing communications.

The other options suggest varying degrees of tolerance or permissiveness towards unsolicited emails, which do not align with Marketo's commitment to responsible marketing practices.