science

Return receipt

Return receipt is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Return receipt rather than just read about it. In short: In email, a return receipt is an acknowledgment by the recipient's email client to the sender of receipt of an email message. What acknowledgment, if any, is sent by the recipient to the sender is dependent on the email software of the recipient.

Key takeaways

Return receipt belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Return receipt to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Return receipt from memory before moving on to harder problems.

Reference excerpt

In email, a return receipt is an acknowledgment by the recipient's email client to the sender of receipt of an email message. What acknowledgment, if any, is sent by the recipient to the sender is dependent on the email software of the recipient. Two notification services are available for email: delivery status notifications (DSNs) and message disposition notifications (MDNs). Whether such an acknowledgment of receipt is sent depends on the configuration of the recipient's email software.

Delivery status notifications

DSN is both a service that may optionally be provided by Message Transfer Agents (MTAs) using the Simple Mail Transfer Protocol (SMTP), or a message format used to return indications of message delivery to the sender of the message. Specifically, the DSN SMTP service is used to request indications of successful delivery or delivery failure (in the DSN format) be returned. Issuance of a DSN upon delivery failure is the default behavior, whereas issuance of a DSN upon successful delivery requires a specific request from the sender. However, for various reasons, it is possible for a message to be delivered, and a DSN is returned to the sender indicating successful delivery, but the message subsequently fails to be seen by the recipient or even made available to them. The DSN SMTP extension, message format, and associated delivery status codes are specified in RFCs 3461 through 3464 and 6522.

Message disposition notifications MDNs provide a notification of the "disposition" of a message - indicating, for example, whether it is read by a recipient, discarded before being read, etc. However, for privacy reasons, and also for backward compatibility, requests for MDNs are entirely advisory in nature - i.e. recipients are free to ignore such requests. The format and usage of MDNs are specified in RFC 3798. A description of how multiple Mail User Agents (MUAs) should handle the generation of MDNs in an Internet Message Access Protocol (IMAP4) environment is provided in RFC 3503. A non-standard but widely used way to request return receipts is with the "Return-Receipt-To:" (RRT) field in the e-mail header, with the email return address specified. The first time a user opens an email message containing this field in the header, the client will typically prompt the user whether to send a return receipt.

See also Acknowledge character Avis de réception, postal equivalent Document automation in supply chain management & logistics Email tracking § Return-receipts Proof of delivery Web bug (which are frequently used in spamming as a way of determining which spam recipients open (and presumably read) before deleting it)

References K. Moore. Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs). RFC 3461, January 2003. G. Vaudreuil. The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages. RFC 3462, January 2003. G. Vaudreuil. Enhanced Mail System Status Codes. RFC 3463, January 2003. K. Moore & G. Vaudreuil. An Extensible Message Format for Delivery Status Notifications. RFC 3464, January 2003. A. Melnikov. Message Disposition Notification (MDN) profile for Internet Message Access Protocol (IMAP). RFC 3503, March 2003. T. Hansen & G. Vaudreuil (editors). Message Disposition Notification. RFC 3798, May 2004.

Worked examples

Example 1 — a first encounter with Return receipt

Start with the simplest possible case. Write down what Return receipt claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Return receipt before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Return receipt ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Return receipt

In research: Return receipt appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Return receipt in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Return receipt is common in secondary-school and first-year university syllabi. It links to neighbouring topics Email, so understanding it makes those chapters shorter.
In everyday life: Look for Return receipt outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Return receipt in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Return receipt means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Return receipt out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Return receipt in simple terms?

Why does Return receipt matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Return receipt?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Return receipt.