we are in Education environment that deals with more than 500,0000 students accounts, we plan to send notifications to a part of them (around 60,000 students) of their exam results.
we plan to do this by using on-prem Exchange (Version 15.1 (Build 2176.2)).
all emails will send to students internal domain e-mail. we will not send any e-mail to External domains.
we have office 365 hybrid setting configuration and all students mailboxes and sender email on office 365 cloud.
I put the sender email to the spam filter allowed list.
I'll use a PowerShell script to run this task.
is there any limitation on sending emails from on-prem exchange server? is there any concerns that i need to be awarded?