The question explores alternatives to Validity for Microsoft deliverability certification. The consensus is that while no direct certification guarantees inbox placement with Microsoft, several strategies and services can improve deliverability. The Certified Senders Alliance (CSA) is mentioned as a whitelist that can improve deliverability if its standards are met. ISIPP SuretyMail's 'Good Senders' list is used by some Microsoft filters. Actively using Microsoft's SNDS tool to monitor reputation, directly contacting Microsoft support, and implementing SPF, DKIM, and DMARC for email authentication are highlighted. Maintaining good sender reputation, warming up IPs, monitoring metrics, and avoiding blacklists are also crucial. It's important to understand that Microsoft uses a variety of signals for determining deliverability, not just certifications.

The question asks about companies offering Microsoft deliverability certification besides Validity. The responses indicate that while there aren't direct alternatives that guarantee deliverability, several options can improve it. The Certified Senders Alliance (CSA) offers a whitelist that can help, and SuretyMail's 'Good Senders' list is used by some Microsoft filter providers. Implementing SPF, DKIM, and DMARC authentication, warming up IP addresses, maintaining a good sender reputation, monitoring metrics, and avoiding blacklists are also crucial for Microsoft deliverability.

The question asks about companies offering Microsoft deliverability certification besides Validity. The answers suggest that no direct certification guarantees inbox placement. One approach involves contacting Microsoft support directly, describing your company and email program. The Microsoft SNDS tool is useful for monitoring your reputation and addressing deliverability issues. It's important to note that Microsoft uses various signals to determine reputation, and while some services can help improve practices, they don't guarantee delivery.

The question is regarding alternative companies to Validity that offer Microsoft deliverability certification. The provided documentation highlights that while no direct certifications exist, several tools and protocols are crucial for achieving good deliverability. Microsoft's SNDS program allows senders to monitor their IP reputation. The Certified Senders Alliance (CSA) provides a certification program that can improve deliverability to participating ISPs, including Microsoft, upon meeting technical and legal requirements. Following Microsoft's guidelines and implementing SPF and DMARC are also vital for authentication and deliverability.