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Main Aspects of Email Working - Coursework Example

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The author od this coursework "Main Aspects of Email Working" discusses the full path that is traveled by an email from sending to receiving. In addition, encryption used for encrypting and decrypting messages, various email communication protocols (such as application, network, and transport protocols) for transferring and receiving an email will be also discussed in the paper. …
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Main Aspects of Email Working
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Download file to see previous pages Tom’s MUA formats the message in an Internet e-mail format and uses the Simple Mail Transfer Protocol (SMTP) to send the message to Tom’s Mail Server (MTA).
Toms MUA transfers the email to a Mail Delivery Agent (MDA). Frequently, the Toms MTA also handles the responsibilities of an MDA. The MDA/MTA accepts the email and forwards it. In figure 1, an MDA forwards the email to an MTA and it enters the first of a series of "network clouds," labeled as a "Company Network (LAN)" cloud.
An email can encounter a network cloud within a large company (LAN) or ISP, or the Internet2. The network cloud may encompass a multitude of mail servers, DNS servers, routers, and other devices and services. These devices may be protected by firewalls, spam filters, and malware detection software that may bounce or even delete an email.
When transferring an email, the sending MTA (Tom’s Mail Server) handles all aspects of mail delivery until the message has been either accepted or rejected by the receiving MTA ((Jane’s Mail Server). As the email clears the queue, it enters the Internet network cloud, where it is routed along a host-to-host chain of servers. Each MTA in the Internet network cloud needs to "stop and ask directions (IP address)" from the Domain Name System (DNS) in order to identify the next MTA in the delivery chain. To find the Janes IP address and mailbox, the MTA must drill down through the Domain Name System (DNS), which consists of a set of servers distributed across the Internet (e.g., .org, .com, .edu, .gov, .net, etc.).
DNS Resolution and Transfer Process: The MTA looks at the destination address provided in the SMTP protocol and asks the appropriate DNS server which Mail Exchange (MX) servers have knowledge of the subdomain or localhost in the email address. The DNS server responds with an MX record. The MTA contacts the MX servers on the MX record in order of priority until finds the designated host for that address domain. ...Download file to see next pagesRead More
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