[Question] SMTP Sending Method

Hello!

I want to make a e-class such as moodle and i will have some users in this class. I want all the announcments or everything else of moodle platform to go on every e-mail of user. Its possible to do this with CWP with DKIM, SPF and all necessary DNS records and settings? One server will have the files of website and another one will have only the mail server. What about gmail? Because the most of my users will have gmail accounts and Google sometimes blocks the SMTP messages or blocks the spam. Its possible to do this with CWP or maybe I should purchase a plan from mailchimp, mxroute, AWS SES etc...

Thank you!