To improve email deliverability to Outlook for blocked outbound prospecting campaigns, several strategies are recommended. Maintaining a clean email list by removing hard bounces is critical, along with implementing double opt-in for new subscribers to ensure genuine interest. Segmentation based on engagement levels helps target more receptive recipients, while personalizing email content increases relevance and trust. Setting recipient expectations regarding email content reduces spam complaints. Technical aspects include proper email authentication using SPF, DKIM, and DMARC, gradually warming up new IP addresses, and avoiding spam trigger words. Additionally, Return Path certification requires dedicated IP and adherence to best practices. List segmentation can be used to improve sender reputation and deliverability.