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.
DomainKeys Identified Mail and Yahoo Mail
Yahoo Mail uses DKIM to fight email forgery.
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
Yahoo offers a free Complaint Feedback Loop program to help email senders minimize complaint rates. Learn how to subscribe or unsubscribe from CFL reports.
4xx or 5xx SMTP error message notifications
Learn what causes SMTP errors and get tips for email administrators on how to troubleshoot them.
Yahoo Mail deliverability FAQs
Get the answers to commonly asked questions about email deliverability to Yahoo Mail accounts.
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.
