A knowledge base article about What are my email sending limits? provided by the UC Berkeley IT Service Hub - Knowledge Portal
UC Berkeley uses bMail (Gmail) as our web-based email service for sending and receiving mail. As Google notes, sending limits can change without notice. Review Gmail Sending Limits in G Suite for current sending limits.
If you manage a campus system, application, or device that needs the ability to send more than Google's daily sending limits, you may have a need for the bConnected On-Premise (bCOP) SMTP service. See: How do I use the bConnected On-Premise (bCOP) service?