University of California, Riverside

C&C Antispam

Will Graylisting Delay E-mail Delivery?

In general, graylisting will not slow down the delivery of e-mail at all. Only the initial e-mail from an unrecognized sender will be delayed by the graylisting system, typically for a period of less than 1 hour. After this initial e-mail is passed to you, further messages from that recipient will be passed automatically by the graylisting system without delay. Mail sent on campus by UCR users using the campus e-mail system will be passed automatically by the graylisting system and thus not subject to delay.

The records of senders maintained by the graylisting system do expire after a certain period of time. If you receive e-mail from a particular sender less frequently than once a month, these e-mails may be repeatedly subject to delay by the graylisting system. If you receive time-critical e-mails from certain sources at this level of infrequency, please contact Phyllis Franco (, Manager, Computer Support Group.

More Information 

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Computing & Communications
Computing & Communications Bldg.

Tel: (951) 827-4741
Fax: (951) 827-4541