• Also spelled mail bomb. Also called email bomb. The sending of an excessive amount of unwanted email to the same recipient. For instance, the generation of many identical emails which are sent repeatedly to the same email address. It also applies to arranging for a given recipient to receive an inordinate amount or email, for instance, by being placed in numerous mailing lists. In addition to any inconvenience this causes a user, it also wastes available bandwidth, and other network resources. Also, the undesired emails themselves. This contrasts with spam, which is unsolicited email directed towards multiple, often millions, of users.