1. Contact ISPs and Email Clients: Reach out to major ISPs and email clients to request whitelisting of your IP address. This usually involves filling out a form and providing details about your email sending practices. 2. Maintain a Good Reputation: Consistently sending high-quality, relevant emails will improve your sender reputation, making it easier to get whitelisted. 3. Use Authentication Protocols: Implementing [SPF](https://) (Sender Policy Framework), [DKIM](https://) (DomainKeys Identified Mail), and [DMARC](https://) (Domain-based Message Authentication, Reporting & Conformance) can help in authenticating your emails, thereby aiding in the whitelisting process.