Limits on sending email in Yahoo Mail

In order to better enforce anti-spam policies, Yahoo does not disclose the number of recipients or emails that can be sent at one time.

• If you've received a notification that a limit has been met, you'll need to wait a set amount of time before you can send more emails. Most sending limit notifications inform you of how long you'll have to wait.
• If you're planning to regularly send bulk email, consider looking into alternate solutions, like a third-party bulk email option.