Daily Sender

In reality, any common outgoing mail server like the ones you find associated with free providers (Yahoo, G mail, AOL, hot mail, etc.) isn’t structured to manage such a wide mailing. Because there are some limitations about the number of emails you can handle for every single sending; and secondly because your bulk email will probably get filtered out by the majority of incoming servers. And You might be considered a spammer even if you’re doing authorized email marketing.
https://www.dailysender.com