ACCC frequently receives reports from outside the university that large numbers of spam emails are sent from Access Point Connections (Student Residence Hall Network System, Zengaku Information Outlet and Network System, and On-Campus Wi-Fi System). Due to this spam sending, even genuine emails sent from our university might be classified as spam. To help solve this issue, ACCC has decided to implement OP25B (Outbound Port25 Blocking), an anti-spam measure, from May 7, 2014.
This measure will block computers connected to an access point from sending emails on TCP/25 port to mail servers with IP addresses other than those of University of Tsukuba (184.108.40.206/16, 220.127.116.11/16). Please note that the measure will not prevent the computers from sending emails on TCP/25 port to the mail servers of University of Tsukuba (including that of Zengaku Computer System).