Delivery delays to Yahoo hosted mail (yahoo.com and sub-domains) on Messaging Gateway

Products

• Symantec Products

Issue/Introduction

Messages sent to Yahoo email addresses fail authentication checks and are rejected with temporary status codes, this results in the email being placed in the delivery queue for retry. Such messages typically remain in the delivery queue until they expire.

Cause

Yahoo uses a policy which may block or delay email that do not use sender authentication methods, such as SPF, DMARC, and DKIM or have not correctly configured their reverse DNS records for their domain.

• For more details on the Yahoo policies in question, please refer to the Yahoo page on Email Industry Standards and Best Practices.

Resolution

Symantec does recommend the addition of SPF, Sender ID, DKIM, and DMARC records in DNS to validate mail delivery. These technical controls act to both protect the reputation of your IP/domains while also meeting the expectations for standards with a growing number of recipients.

 

Symantec offers Email Fraud Protection, which is a product that automates the configuration and monitoring of sender authentication for SMG and various cloud and email services. For more information, please see Symantec Email Fraud Protection.

 

If manual configuration is preferred, guidance for Setting up sender authentication for outbound mail when implementing SPF/Sender ID/DKIM/DMARC may be located in our support articles.