MAIL RELAY Meaning and
Definition
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Mail relay refers to a network function or process that assists in forwarding or delivering email messages across multiple servers or networks. It involves the transmission of email from one mail server to another, ensuring that the message reaches its intended recipient.
In a mail relay system, a mail server acts as an intermediary between the sender and the recipient's mail servers. When an email is sent, the relay server receives the message and then determines the appropriate destination based on the recipient's email address. It then relays the message to the next server, either within the same network or across different networks, until it reaches the final destination.
Mail relays are commonly used when the sender and recipient are on different networks or if the recipient's mail server is behind a firewall or spam filter. They help to improve the efficiency and reliability of email delivery, especially in complex network environments. They also assist in reducing the load on individual mail servers and provide better control over the flow of email traffic.
A mail relay can operate in different modes, such as open relay or closed relay. An open relay allows anyone to use the server for sending emails, which can lead to abuse and spamming. In contrast, a closed relay restricts access, either by allowing only specific IP addresses or requiring authentication, ensuring that only authorized users can relay messages.
Overall, mail relay plays a crucial role in the successful transmission of emails, providing seamless communication between senders and recipients across various networks and servers.
Etymology of MAIL RELAY
The word "mail relay" has its etymology rooted in both the term "mail" and the term "relay".
The term "mail" originated from Old French "male" and Latin "māla", which referred to a bag or a wallet used for carrying letters. It later transitioned to designate the letters or packages themselves. The word "mail" in the context of communication has been in use since the 14th century.
"Relay", on the other hand, has its origins in Old French as well. It comes from the verb "relayer", which meant "to change horses" or "to provide fresh horses". This action was necessary in long-distance travel when horses became tired and needed to be replaced. Over time, "relay" expanded its meaning to refer to the exchange or transfer of anything from one person or place to another.
