Microsoft Office 365, branded as "Cowboy Mail" is the email system used by OSU students, faculty, and staff. Microsoft Office 365 also includes access to other Microsoft applications and services.
LISTSERV mailing lists are a way to distribute emails to a large number of recipients.
LSMTP.okstate.edu is a Proofpoint Protection Server configured to allow anonymous SMTP relay from permitted servers, printers, and other devices on the OSU Network.