Bulk email: how to send and how often?

[D-Rod]

My friend has a bowling alley business and they have about 3,000 names and I think they might bring it up to 5,000 names and would like to send out emails on upcoming leagues, events, specials etc. Their guy is only able to send out about 50 a day and that is not working. As I know nothing on how to do this please let me know if I should suggest an app or a service or how to do the whole list at one time. Also, how often do you think they should be mailing the people?


Thanks in advance for any help.