[Plugin: Subscribe2] Divide the mail sent in groups ?

@steg,

Emails can be sent in groups of 50 recipients by setting the number of recipients per email to 50 in the Subscribe2-> Settings page. The groups are all sent at the same time though.

If you want to defer sending each group for a time then you need a plugin that throttles the email sending like this one:
https://wpplugins.com/plugin/76/wordpress-mail-queue-wpmq/

Thanks Mattyrob!!!