Are You Having Trouble Mailing To Yahoo?

Since late last year Yahoo has become very aggressive with bulk email.



They introduced a new error code "451" to notify senders that "They just don't want your email." Here are a few interesting articles outlining the fixes people have tried:

1. Yahoo Mail Servers Rejecting Email
2. Some Advice From Yahoo!
3. Overcoming Email Deliverability

Our analysis confirms that delivering to Yahoo is linked to the rate at which you deliver emails and the time when you send the emails. People who send large batches of SPAM deliver email from 9pm to 11pm EST. They typically try to deliver over 20K messages per minutes. By throttling down your Yahoo delivery rates you will see an improvement in deliverability.

Do you have insight to share? Please add a comment.