Best practices to help bulk email you send to Yahoo email addresses get to your contacts.

Common SMTP error codes when sending messages to Yahoo Mail accounts, and why you would receive them.narrowed first column in table

See the IP addresses that Yahoo Mail sends emails from.

Learn about possible SMTP errors that happen when your email is rejected by Yahoo Mail.

Learn how to subscribe or unsubscribe from CFL reports, and how Yahoo is helping bulk senders understand and minimize complaint rates.

Learn what causes SMTP errors and get tips for email administrators on how to troubleshoot them.

Learn about the Abuse Reporting Format and what info Yahoo provides in our CFL reports.

Get the answers to commonly asked questions about email deliverability to Yahoo Mail accounts.

Learn why emails sent to Yahoo Mail accounts might be returned as a result of recent updates to Yahoo's DMARC policy.