Infinite Campus includes functionality to send out messages to a variety of audiences.
Notes below include support documents that thoroughly cover the use of Class Messenger (most commonly used by teachers and the school office) and Staff Messenger (most commonly used by school office and district office, though expected to eventually be phased out in favor of Blackboard messenger).
Class Messenger
Note that parents will need to have set up an account to receive messages via Infinite Campus.
Attachments are limited in size (10 MB) and quantity (1 attachment per message).
Send-General-Class-Messages-to-Students-and-Parents.pdf
Create-a-Template-for-Sending-Messages.pdf
Delete
Staff Messenger
E-mail attachments are limited in size (10 MB) and quantity (1 attachment per message).