Is it necessary to subscribe users within Joomla to send mass emails?

[nfbauti]

Best regards, and thank you for this mass email feature.

1) With this component, can I send mass emails without having subscribed users within Joomla, or do I need to subscribe users within Joomla with their respective email addresses?

I'm interested in the component, but I don't want to have to manually or automatically register users. I just want to have a mailing list and send a single email to all the emails on the list.

2) How many emails can I send at once, or what is the mass sending capacity?

Thank you for your kind response.