- Signature block
A signature block (often abbreviated as signature, sig block, sig file, .sig, dot sig, siggy, or just sig) is a block of text automatically appended at the bottom of an e-mail message, Usenet article, or forum post. This has the effect of "signing off" the message and in a reply message of indicating that no more response follows. It is common practice for a signature block to consist of one or more lines containing some brief information on the author of the message. Note that a sig block is not the same as a digital signature. A sig block is easily forged, whereas a digital signature uses cryptographic techniques to provide verifiable proof of authorship.
Information usually contained in a signature block includes the poster's name, phone number and email address, along with other contact details if required, such as URLs for sites owned or favoured by the author. A quotation is often included (occasionally automatically generated by such tools as fortune), or an ASCII art picture. Strict rules of capitalization are not followed. Among some groups of people it has been common to include self-classification codes, though the practice is waning.
E-mail and Usenet
An e-mail signature is a block of text appended to the end of an e-mail message often containing the sender's name, address, phone number, disclaimer or other contact information. Most e-mail clients, including Mozilla Thunderbird and Eudora, can be configured to automatically append an e-mail signature with each new message. A shortened form of a signature block (sometimes called a "signature line"), only including one's name, often with some distinguishing prefix, can be used to simply indicate the end of a post or response. Most e-mail servers can be configured to append e-mail signatures to all outgoing mail as well. However, when multiple replies to the same post occur, care should be taken to prevent multiple signatures from building up so that message lengths remains legible and message size manageable.
Since by definition these blocks are added automatically to a message, usually regardless of its content, there are guidelines of netiquette regarding their size. The most common guideline, called the McQuary limit, is a size of no more than four lines of less than eighty columns each. This keeps the overall size of the message down, conserving bandwidth as well as the time required to read the message, and ensures that eighty-column terminals can display the sig block properly.
The formatting of the sig block is prescribed somewhat more firmly: it should be displayed as plain text in a fixed-width font (no HTML, images, or other rich text), and must be delimited from the body of the message by a single line consisting of exactly two hyphens, followed by a space, followed by the end of line (i.e., "-- \n"). This latter prescription, which goes by many names, including "sig dashes", "signature cut line", "sig-marker", and "sig separator", allows software to automatically mark or remove the sig block as the receiver desires. The signature prefix chosen can be different for different people serving as a distinguishing feature of their signatures. A correct delimiter is required for a news posting program to receive the Good Netkeeping Seal of Approval.
E-mail signatures in business
Many corporations have internal policies requiring outgoing e-mails to have lengthy "signatures" appended to them, listing dozens of contact methods, disclaiming legal liabilities, notifying of virus scanning methods, and so forth.
Germany has laws requiring companies to disclose their company name, registration number, place of registration etc. in e-mail signatures. Ireland's Director of Corporate Enforcement requires all limited companies operating websites to disclose such information in their e-mails. The UK's ECommerce Regulations require this information in all emails from limited companies as well. While criticized by some as overly bureaucratic, these regulations only extend existing laws for (paper) business correspondence to email.
On web forums, the rules are often less strict on how a signature block is formatted, as Web browsers typically are not operated within the same constraints as text interface applications. Users will typically use a "signature" text area in their given profile for input, which can then allow a user to turn off signatures. Depending on the board's capabilities, signatures may range from a simple line or two of text to an elaborately-constructed HTML piece. Images are often allowed as well, including dynamically updated images usually hosted remotely and modified by a server-side script.
Signatures are seen as an art form by many of their creators, and there are many websites centered around their creation and display. Some of these websites have competitions, battles and signature of the week contests, where members submit their entries to have them featured on the website.
With FidoNet, echomail and netmail software would often add an origin line at the end of a message. This would indicate the FidoNet address and name of the originating system (not the user). The user posting the message would generally not have any control over the origin line. However, single-line taglines, added under user control, would often contain a humorous or witty saying. Multi-line user signature blocks were rare.
- Kibo, a Usenet poster famous for his absurdly long signature.
- Signature tag
Notes and references
- ^ See Charles H. Lindsey: Usenet Best Practice, 2005, and also RFC 3676: The Text/Plain Format and DelSp Parameters, section 4.3, 2004, and RFC 1849: “Son of 1036”: News Article Format and Transmission, section 4.3.2, 2010 (first circulated in 1994).
- ^ strictly speaking, only in emails concerning business dealings
- ^ "German bureaucracy, coming to your e-mail now"
- ^ "Irish ODCE Information Notice I/2007/2 - Disclosure of Company Particulars in E-Communications and on Websites"
- ^ "ECommerce Regulations"
- ^ "FidoNet EchoMail Specification"
- ^ "A Proposed Replacement For FTS-0004"
- RFC 1855, "Netiquette Guidelines" (section 2.1.1 contains guidelines on mail)
- RFC 3676, (4.3 Usenet Signature Convention)
- What are the restrictions for a proper signature?
- Information Release from Ireland's ODCE (pdf)
- A collection of sigs found on Slashdot
- Email Signatures examples Articles and tips via WiseStamp
Wikimedia Foundation. 2010.
Look at other dictionaries:
Signature — A signature (from Latin signare , sign ) is a handwritten (and sometimes stylized) depiction of someone s name, nickname or even a simple X that a person writes on documents as a proof of identity and intent. The writer of a signature is a… … Wikipedia
Signature (disambiguation) — A signature is a hand written, stylized version of someone s name.Signature may also mean: NOTOC In computers*Signature block, text automatically appended at the bottom of an e mail message, Usenet article, or forum post. *Method signature, in… … Wikipedia
Signature Mini Suites of Minetta New York (New York City) — Signature Mini Suites of Minetta New York country: United States, city: New York City (Greenwich Village) Signature Mini Suites of Minetta New York Signature Mini Suites of Minetta New York is located in the heart of Greenwich Village Historic… … International hotels
Signature Class — (Гургаон,Индия) Категория отеля: Адрес: 780, Block B, Sushant Lok 1, 122002 Гургаон … Каталог отелей
Signature Hotel @ Puchong Setiawalk — (Puchong,Малайзия) Категория отеля: 3 звездочный отель Адрес: Bl … Каталог отелей
Digital signature — This article is about secure cryptographic signatures. For simple signatures in digital form, see Electronic signature. A digital signature or digital signature scheme is a mathematical scheme for demonstrating the authenticity of a digital… … Wikipedia
Merkle signature scheme — The Merkle signature scheme is a digital signature scheme based on hash trees (also called Merkle trees) and one time signatures such as the Lamport signature scheme. It was developed by Ralph Merkle in the late 70s and is an alternative to… … Wikipedia
Lamport signature — In cryptography, a Lamport signature or Lamport one time signature scheme is a method for constructing a digital signature. Lamport signatures can be built from any cryptographically secure one way function; usually a cryptographic hash function… … Wikipedia
Digital Signature Algorithm — The Digital Signature Algorithm (DSA) is a United States Federal Government standard or FIPS for digital signatures. It was proposed by the National Institute of Standards and Technology (NIST) in August 1991 for use in their Digital Signature… … Wikipedia
Musgrave Block — The Musgrave Block is an east west trending belt of Proterozoic granulite gneiss basement rocks approximately 500km long. The Musgrave Block extends from western South Australia into Western Australia. The Musgrave Block is primarily exposed… … Wikipedia