To get Proofpoint to unblock your IP, the process involves a multi-faceted approach. First, it's crucial to understand why you were blocklisted in the first place, identifying the root cause such as spam traps, complaints, or poor sending practices, and rectifying these issues before requesting delisting. Review and improve your sending practices, ensuring compliance with email best practices, including email authentication via SPF, DKIM, and DMARC, which can improve deliverability and avoid blocks. Proper IP warming is essential, involving gradually increasing sending volume and monitoring engagement to establish trust and avoid triggering filters. Engage with Proofpoint directly through their support channels or postmaster email (<mailto:postmaster@proofpoint.com>), providing detailed information about the IP address, the reasons for the block, and the steps taken to resolve the issues. Proactive reputation management, including setting up feedback loops, engaging with postmasters, and monitoring blocklists, is vital. If the issue is specific to Apple, contact their postmaster team directly. Utilizing deliverability testing tools can help identify any deliverability issues. If your IP is listed on Spamhaus, check the specific listing reason, address any security issues, and follow their delisting procedures. Monitoring your sending reputation and volume closely, addressing complaints promptly, and ensuring compliance with Google's sender guidelines are also recommended. Finally, consider trying mailop, as a Proofpoint representative has been known to respond there. The key is to maintain a high sender reputation and demonstrate a commitment to best practices.