The WordPress Mass Email Sender Plugin by WPMU DEV
This plugin helps to send emails to every user according to the requirement on a multisite network. It is easy to use and integrated with shortcodes. Users can unsubscribe to the mailing list anytime with just one click. It even has an option to send a test email, so that you can check your messages before sending to your entire network.

BigHearts – Charity and Donation WordPress Theme
Improve the state of the world with our BigHearts template and GiveWp Donation Plugin. Find those who need rescue or want to provide relief easily with our predesigned layouts. Let us help you make a difference with your charitable foundation website.