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Delivery of enough email to a mailbox to overload the mailbox or perhaps even the system that the mailbox is hosted on.
1. A mailbox might be targeted to receive hundreds or thousands of messages; this makes it difficult or impossible for the victim to use their own mailbox, possibly subjects them to additional charges for storage space, and might cause them to miss messages entirely due to overflow.
2. A message will be bulk-emailed, with the intended victim's address forged in the From: and/or Reply-To: lines of the headers. The victim is then deluged with responses, mostly angry.
3. One forges subscription requests to many mailing lists, all for one recipient. The result is a huge barrage of email arriving in the victim's email box, all of it unwanted, but "legitimate". Many mailing list administrators are countering this form of abuse by sending a confirmation email to each subscription request, which must be returned in order to be subscribed to the list.
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