What is an SMTP server ?

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The acronym SMTP stands for Simple Mail Transfer Protocol, the procedure behind the email flow on the internet.

What happens when you send out an email? The process of email delivery is actually quite similar to classical mail: an organized system takes care of your envelope and through a series of steps it drops it off to your recipient.

In this process, the SMTP server is simply a computer running SMTP, and which acts more or less like the postman.

Once the messages have been picked up they are sent to this server, which takes care of concretely delivering emails to their recipients.
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What is Port (computer networking)

In the internet protocol suite, a port is an endpoint of communication in an operating system. While the term is also used for female connectors on hardware devices (see computer port), in software it is a logical construct that identifies a specific process or a type of network service. A port is always associated with an IP address of a host and the protocol type of the communication, and thus completes the destination or origination network address of a communication session. A port is identified for each address and protocol by a 16-bit number, commonly known as the port number. For example, an address may be 'protocol: TCP, IP address: 1.2.3.4, port number: 80', which may be written 1.2.3.4:80 when the protocol is known from context. Specific port numbers are often used to identify specific services. _________________________

What is a localhost ?

In computer networking, localhost is a hostname that means this computer. It is used to access the network services that are running on the host via its loopback network interface. Using the loopback interface bypasses any local network interface hardware. The local loopback mechanism is useful for testing software during development, independently of any networking configurations. For example, if a computer has been configured to provide a website, directing a locally running web browser to http://localhost may display its home page. On most computer systems, localhost resolves to the IP address 127.0.0.1, which is the most commonly used IPv4 loopback address, and to the IPv6 loopback address. _________________________

What is Back Door?

A back door is generally a piece of code intentionally left by the developer of the software or firmware that allows access without going through the normal security process. Back doors may also be the result of different malware/virus attacks that leave a method for remote, unsecured access into a device once the malicious code has been executed. _________________________

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