The correct answer is Spam.Spam is electronic junk mail or junk newsgroup postings.Some people define spam even more generally as any unsolicited email.The pure message looks for message characteristics that are common to spam messages, including the followingKey phrases such as œSpecial One-Time Offer, œCall Now, œAct Now, œYou Have Won¦, œHuman Growth Hormone, etc.Characteristics of the text, such as œshouting text (all capitals).The email distribution agent was used to send the message.Inconsistencies or errors in the header information.From and To header fields being the same (often an indication of a fake From address).Email spoofing is a technique used in spam and phishing attacks to trick users into thinking a message came from a person or entity they either know or can trust.In spoofing attacks, the sender forges email headers so that client software displays the fraudulent sender address, which most users take at face value.It is a form of cyberattack in which a hacker sends an email that has been manipulated to seem as if it originated from a trusted source.Mail spool shows emails that are waiting to be delivered or have returned an error.Users can apply filters and take action on these emails.It is the default behavior of the Symfony mailer is to send the email messages immediately.A sniffer script can be used legitimately or illegitimately to capture data being transmitted on a network.A network router reads every packet of data passed to it, determining whether it is intended for a destination within the router's own network or whether it should be passed further along with the Internet.A router with a sniffer, however, may be able to read the data in the packet as well as the source and destination addresses.The term "sniffer" is occasionally used for a program that analyzes data other than network traffic.For example, a database could be analyzed for certain kinds of duplication.