question 2 answer

Electronic mail is a facility which allows users at workstations and terminals to create and exchange messages. As we all know that the simplest form of e-mail is the single –system facility. This facility allows to all the users of all those shared computer system to exchange the messages to each other. This type of facility can be used in a mainframe environment in which multiple users share the same system. Every user should register on the system and should have a unique identifier. One mailbox is associated with each user. Any incoming mail is simply store as a file under that user’s mailbox directory.
Now according to the question that the people like to send same message to three different users instead of sending it individually. While doing this thing we can find some difference such as time saving, can prioritize easily while sending.
While sending the same message to three different users following procedure is to be used:
1. User directory: This is mostly used by the system. It may also be accessible to users to able to look up address on the directory of the user.
2. Multiple addressing: By using this process any user can send the same message to different users at same time. This will helps to copy the message and sent to multiple addresses. By doing so same message will be sent to the entire different user at time. By doing so we can save some time for creating the same messages for multiple times. While sending the message in this method we can create the distribution list and also by the central administrative function.
3. Message priority: While sending the same message to the multiple addresses, user can create the priority as well. After prioritizing the address the message will be delivered rapidly to the high priority address created by the user. This function will help to notify the recipient of the arrival of the high priority messages.
4. Status information: A user may request the notification of delivery by the recipient. Even a user could the query present status of a message. For example: qued for transmission, transmitted but receipt confirmation not yet received.
5. Interface to other facilities: These will include other electronic systems, such as telex, and physical distribution facilities, such as courier and the public mail service.
The process will be same for the single address while sending the same message to the different address. While sending the message to the different address a user has to create the same message different time according to the priority of the address. To perform all these process the SMTP have to follow the following standards:
• Post Office Protocol (POP3): POP3 allows an email client to download an e-mail from an email server. POP3 UAs connect via TCP/IP to the server. The UA enters the username and password. Once the user name and password was been authorized UA can issue POP3 commands to retrieve and delete the mail.
• Internet Mail Access Protocol (IMAP): As with POP#, IMAP also enables an email client to access mail and email server. IMAP also uses TCP/IP, with server TCP. IMAP is bit complex than POP3. It provides stronger authentication than POP3 and provides other functions not supported by POP3.
• Simple Mail Transfer Protocol (SMTP): This type of protocol mainly used to transfer of mail from UA to and MTA and from MTA to another.
• Multipurpose Internet Mail Extensions (MIME): Supplements SMTP allows the encapsulation of multimedia messages inside of standard SMTP message.