What companies offer Microsoft deliverability certification besides Validity?

Email marketer from Stack Overflow suggests using Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM) and Domain-based Message Authentication, Reporting & Conformance (DMARC) to authenticate email and improve deliverability to Outlook.

Email marketer from EmailVendorSelection mentions the Certified Senders Alliance (CSA) as an email whitelist that can help with deliverability to various ISPs, including Microsoft. Joining CSA requires adhering to certain quality standards.

Email marketer from Mailjet highlights key deliverability factors such as sender reputation, authentication (SPF, DKIM, DMARC), engagement metrics, and content quality, all of which contribute to better deliverability to Microsoft and other ISPs.

Email marketer from ISIPP SuretyMail explains their 'Good Senders' list can improve email deliverability as they work with a number of providers including Microsoft.

Email marketer from Reddit recommends warming up your sending IP address, maintaining a good sender reputation, and monitoring bounce rates to improve deliverability across all ISPs, including Microsoft.

Email marketer from SuperOffice mentions to check your IP reputation. Keep an eye on blacklists. ISPs and mailbox providers often use blacklists to identify and block spammers. If your IP address is on a blacklist, your emails may not reach the intended recipients. Use tools such as MXToolbox or Blacklist Check to monitor your IP address and take steps to remove it if necessary.

Email marketer from Validity (previously Return Path) discusses their certification program, which aims to improve email deliverability by ensuring that senders adhere to best practices. While they are a prominent player, the question seeks alternatives.

Email marketer from Email Geeks mentions that the European Certified Sender Alliance (CSA) has a list of certified senders that Microsoft uses. He also mentions SuretyMail as a service used by Microsoft. However, he notes that Validity has a unique offering with Microsoft.

Email marketer from MailerQ discusses the importance of IP address reputation and suggests using dedicated IP addresses and following best practices for email authentication (SPF, DKIM, DMARC) to improve deliverability to Microsoft and other mailbox providers.

Marketer from Email Geeks shares that the European Certified Sender Alliance publishes a list of member senders used by ISPs/Mailbox-Providers, including Microsoft. He also mentions SuretyMail from ISIPP, noting Microsoft uses filter providers who may use SuretyMail's "Good Senders" list. However, he believes Validity has a unique service offering with Microsoft.

Expert from Email Geeks shares a support request form for Microsoft that can be used to request assistance regarding deliverability issues.

Expert from Word to the Wise explains that there aren't really any 'certifications' that guarantee deliverability to Microsoft. Microsoft uses a variety of signals to determine reputation and deliverability, and while some organizations like Validity offer services that can improve your sending practices, they don't provide a guaranteed pass to the inbox.

Expert from Email Geeks shares his experience of describing his company, program, and the problem to Microsoft support, which resolved the issue within hours. He notes it's not a permanent fix, but has worked for 8-12 months each time he's done it.

Expert from Word to the Wise shares how to use the Microsoft SNDS tool for understanding and troubleshooting delivery issues. This tool provides data related to spam complaints and other reputation metrics to improve sending practices with Microsoft

Documentation from Certified Senders Alliance describes the requirements for becoming a certified sender, which includes technical and legal requirements. Acceptance into the CSA program can improve deliverability to participating ISPs, including Microsoft.

Documentation from RFC defines the standards for SPF records, describing how they should be formatted and used by receiving mail servers to verify the authenticity of sending domains.

Documentation from Microsoft provides guidelines and information for senders to ensure deliverability to Outlook.com and Hotmail. It is not a certification but offers best practices.

Documentation from DMARC.org outlines the steps required to implement DMARC, including creating a DMARC record, setting a policy (none, quarantine, reject), and monitoring DMARC reports. Implementing DMARC can significantly improve email authentication and deliverability.

Documentation from Microsoft explains the Sender Network Data Services (SNDS) program, which provides data about your sending IP addresses to help identify and resolve deliverability issues. While not a certification, it allows senders to monitor their reputation with Microsoft.