In online advertisments, there is a common behaviour of sending mass e-mails to many users or others at one span of time. The messages are the same and are send to numerous users at once. This is famously known as E-mail Spams.
These are based on Unsolicited Bulk E-mail (UBE), these are unwanted and a very annoying behaviour. However, it is duely on rise thse days. These are automated and mails are send on regular intervals.