Internet mail protocols have become not just an enabling technology for messaging, but a programming interface on top of which core applications are built. Size Report. DOWNLOAD PDF Visual Basic Internet Programming. Read more Mozillas Firefox, Thunderbird und Lightning: Internet, Mail und mehr. Programming Internet Email HQ [SMTP,MIME,IMAP,POP3] Communicating with Email and the Internet: Learning Made Simple · Read more.
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[Download free pdf] Programming Internet Email: Mastering Internet Messaging # in eBooks | | | File type: PDF | File size: example of the former would be an e-mail client program or even an Internet e- mail . Internet background would call the e-mail program on a personal com-. Programming Internet Email: Mastering Internet Messaging Systems [David Wood] on raudone.info *FREE* shipping on qualifying offers. The Internet's killer .
Based on the data submitted, the server takes an appropriate action and produces a customized response. Once they fill in the requested data and hit the submit button, the browser packs the form data and submits them to the server, using either a GET request or a POST request. Each field has a name and can take on a specified value. This is known as a query string. It will send the query string to the server as part of the request.
Special characters are not allowed inside the query string. If this amount exceed a server-specific threshold, the server would return an error " Request URI too Large". The URL-encoded query string would appear on the address box of the browser.
POST method overcomes these drawbacks. If POST request method is used, the query string will be sent in the body of the request message, where the amount is not limited. The request headers Content-Type and Content-Length are used to notify the server the type and the length of the query string. POST method will be discussed later. Suppose the user enters "Peter Lee" as the username, "" as password; and clicks the submit button.
You should never use send your password without proper encryption.
Hostname: The DNS domain name e. Port: The TCP port number that the server is listening for incoming requests from the clients. Path-and-file-name: The name and location of the requested resource, under the server document base directory.
URL rewriting for session management, e.
POST vs GET for Submitting Form Data As mentioned in the previous section, POST request has the following advantage compared with the GET request in sending the query string: The amount of data that can be posted is unlimited, as they are kept in the request body, which is often sent to the server in a separate data stream. The query string is not shown on the address box of the browser. Hence, sending password using a POST request is absolutely not secure. When the user clicks the submit button, the browser send the form data and the content of the selected file s.
The original local file name could be supplied as a "filename" parameter, or in the "Content-Disposition: form-data" header.
Read " Uploading Files in Servlet 3. This is often used to make a connection through a proxy.
Programming Internet Mail
Extension methods also error codes and headers can be defined to extend the functionality of the HTTP protocol.
A client can use additional request headers such as Accept, Accept-Language, Accept-Charset, Accept-Encoding to tell the server what it can handle or which content it prefers. If the server possesses multiple versions of the same document in different format, it will return the format that the client prefers. This process is called content negotiation.
For example, file extensions ". When a file is returned to the client, the server has to put up a Content-Type response header to inform the client the media type of the data. If the server has 2 formats of the "logo": "logo. For Example: AddLanguage en. Email has become used on smartphones and on all types of computers.
Mobile "apps" for email increase accessibility to the medium for users who are out of their home. While in the earliest years of email, users could only access email on desktop computers, in the s, it is possible for users to check their email when they are away from home, whether they are across town or across the world.
Alerts can also be sent to the smartphone or other device to notify them immediately of new messages. This has given email the ability to be used for more frequent communication between users and allowed them to check their email and write messages throughout the day. As of [update] , there were approximately 1.
Individuals often check email on smartphones for both personal and work-related messages. It was found that US adults check their email more than they browse the web or check their Facebook accounts, making email the most popular activity for users to do on their smartphones. However, the percentage of consumers using email on smartphone ranges and differs dramatically across different countries. As of [update] , the number of Americans visiting email web sites had fallen 6 percent after peaking in November For persons 12 to 17, the number was down 18 percent.
Young people preferred instant messaging , texting and social media. A survey of Android users showed that persons 13 to 24 used messaging apps 3. Email messages may have one or more attachments, which are additional files that are appended to the email.
Typical attachments include Microsoft Word documents, pdf documents and scanned images of paper documents. In principle there is no technical restriction on the size or number of attachments, but in practice email clients, servers and Internet service providers implement various limitations on the size of files, or complete email - typically to 25MB or less.
Where larger files need to be shared, file hosting services of various sorts are available; and generally suggested. The ubiquity of email for knowledge workers and "white collar" employees has led to concerns that recipients face an " information overload " in dealing with increasing volumes of email.
This can lead to increased stress, decreased satisfaction with work, and some observers even argue it could have a significant negative economic effect,  as efforts to read the many emails could reduce productivity. Email "spam" is the term used to describe unsolicited bulk email.
The US CAN-SPAM Act of and similar laws elsewhere  had some impact, and a number of effective anti-spam techniques now largely mitigate the impact of spam by filtering or rejecting it for most users,  but the volume sent is still very high—and increasingly consists not of advertisements for products, but malicious content or links.
A range of malicious email types exist. These range from various types of email scams , including "social engineering" scams such as advance-fee scam "Nigerian letters", to phishing , email bombardment and email worms. Email spoofing occurs when the email message header is designed to make the message appear to come from a known or trusted source.
Email spam and phishing methods typically use spoofing to mislead the recipient about the true message origin. Email spoofing may be done as a prank, or as part of a criminal effort to defraud an individual or organization.
An example of a potentially fraudulent email spoofing is if an individual creates an email which appears to be an invoice from a major company, and then sends it to one or more recipients. In some cases, these fraudulent emails incorporate the logo of the purported organization and even the email address may appear legitimate. Email bombing is the intentional sending of large volumes of messages to a target address.
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The overloading of the target email address can render it unusable and can even cause the mail server to crash. Today it can be important to distinguish between Internet and internal email systems. Internet email may travel and be stored on networks and computers without the sender's or the recipient's control. During the transit time it is possible that third parties read or even modify the content.
Internal mail systems, in which the information never leaves the organizational network, may be more secure, although information technology personnel and others whose function may involve monitoring or managing may be accessing the email of other employees.
There are cryptography applications that can serve as a remedy to one or more of the above. Additionally, many mail user agents do not protect logins and passwords, making them easy to intercept by an attacker.
Encrypted authentication schemes such as SASL prevent this. Finally, attached files share many of the same hazards as those found in peer-to-peer filesharing.
Programming Internet Email HQ [SMTP,MIME,IMAP,POP3]
Attached files may contain trojans or viruses. Flaming occurs when a person sends a message or many messages with angry or antagonistic content. The term is derived from the use of the word "incendiary" to describe particularly heated email discussions.
The ease and impersonality of email communications mean that the social norms that encourage civility in person or via telephone do not exist and civility may be forgotten. Also known as "email fatigue", email bankruptcy is when a user ignores a large number of email messages after falling behind in reading and answering them.
The reason for falling behind is often due to information overload and a general sense there is so much information that it is not possible to read it all. As a solution, people occasionally send a "boilerplate" message explaining that their email inbox is full, and that they are in the process of clearing out all the messages. Harvard University law professor Lawrence Lessig is credited with coining this term, but he may only have popularized it.
MIME now allows body content text and some header content text in international character sets, but other headers and email addresses using UTF-8, while standardized  have yet to be widely adopted.
The original SMTP mail service provides limited mechanisms for tracking a transmitted message, and none for verifying that it has been delivered or read. It requires that each mail server must either deliver it onward or return a failure notice bounce message , but both software bugs and system failures can cause messages to be lost. To remedy this, the IETF introduced Delivery Status Notifications delivery receipts and Message Disposition Notifications return receipts ; however, these are not universally deployed in production.
A complete Message Tracking mechanism was also defined, but it never gained traction; see RFCs  through In the absence of standard methods, a range of system based around the use of web bugs have been developed.
However, these are often seen as underhand or raising privacy concerns,    and only work with email clients that support rendering of HTML. Many mail clients now default to not showing "web content". From Wikipedia, the free encyclopedia.
This article is about the communications medium. For the former manufacturing conglomerate, see Email Limited. For the discontinued Google product, see Inbox by Gmail. Main article: History of email. This section needs additional citations for verification.
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: Email attachment. Email spam. Email spoofing. Email bomb. Email privacy. Email bankruptcy. Further information: Network Working Group. Archived from the original on 16 January Retrieved 19 January World's first free linguistic email service supports eight India languages". Archived from the original on Luckett, What's News: Retrieved Archived from the original on May 9, Oxford University Press.
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Programming Internet Email
Introducing Computer Science - B. Harvey, M.Zubrow; A. Harvey, M. Every Web server that is connected to the Internet is given a unique address made up of a series of four numbers between 0 and separated by periods. For developers, however, Internet e-mail involves a dizzying array of standards and formats. Currently you must be using any sort of Web browser while you are navigating through my site tutorialspoint.