Bulk email industry standards and best practices
Best practices to help bulk email you send to Yahoo email addresses get to your contacts.
SMTP error code table
Common SMTP error codes when sending messages to Yahoo Mail accounts, and why you would receive them.narrowed first column in table
Yahoo Outbound IP addresses
See the IP addresses that Yahoo Mail sends emails from.
Email sent to Yahoo Mail addresses is rejected
Learn about possible SMTP errors that happen when your email is rejected by Yahoo Mail.
Complaint Feedback Loop program
Learn how to subscribe or unsubscribe from CFL reports, and how Yahoo is helping bulk senders understand and minimize complaint rates.
Yahoo DMARC policy
Learn why emails sent to Yahoo Mail accounts might be returned as a result of recent updates to Yahoo's DMARC policy.
Yahoo Mail deliverability FAQs
Get the answers to commonly asked questions about email deliverability to Yahoo Mail accounts.
Yahoo Complaint Feedback Loop service FAQ
Get answers to the most common questions regarding the Yahoo Complaint Feedback Loop (CFL) service.
Help for Postmaster sending issues
Get the resources to resolve issues sending email to Yahoo Mail accounts.
4xx SMTP error codes
Learn what each 4xx SMTP error code means, and how you can prevent them from happening in the future.
