How many Yahoo mail bulk bbc copy emails can be sent at one time? This is not spam. A newsletter.?

Just trying to figure out how many bbc copy emails to send as bulk email occasionally. Is there a limit of 100 or 200 bbc copy emails? It is not spam, just an update & newsletter for those that signed up for it, so just want to make sure a bulk email will work at YahooMail before I sign up a yahoo email.