The debate over whether to write e mail or email is one of the most persistent style questions in modern digital communication. Now, for decades, writers, editors, and style guides have wrestled with the evolution of this term as it migrated from technical jargon into everyday vocabulary. The short answer is that email—written as a single, unhyphenated word—is now the overwhelming standard in almost all major style guides and general usage. On the flip side, understanding why this shift happened and where the outliers remain helps you write with authority and consistency That alone is useful..
The Evolution of a Digital Noun
To understand the current consensus, it helps to look at the linguistic lifecycle of technological terms. New compound words in English typically follow a predictable trajectory: they start as two separate words (electronic mail), become hyphenated (e-mail) as they gain traction, and eventually fuse into a single closed compound (email) once they are fully lexicalized—meaning speakers treat them as a single concept rather than a phrase The details matter here..
Electronic mail was the original descriptive phrase. As the technology became ubiquitous in the 1980s and 1990s, the abbreviation e-mail (with a hyphen) became the dominant standard. The hyphen served a crucial purpose: it signaled that the "e" was an abbreviation for "electronic," distinguishing it from the letter "e" itself. Major publications like The New York Times and The Washington Post, along with the AP Stylebook and the Chicago Manual of Style, championed the hyphen for years Surprisingly effective..
By the early 2010s, however, the tide had turned. The Chicago Manual of Style followed suit in its 16th edition (2010) and solidified the stance in the 17th edition. Because of that, in 2011, the AP Stylebook made the landmark decision to drop the hyphen, adopting email. The term was so common that the hyphen began to feel like an unnecessary speed bump for the reader. Today, virtually every major dictionary—Merriam-Webster, Oxford English Dictionary, Cambridge, and Collins—lists the closed compound email as the primary entry Worth knowing..
Why "Email" Won: The Mechanics of Usage
The victory of email over e-mail wasn't arbitrary; it was driven by efficiency and analogy. In practice, english has a strong tendency to shed hyphens from high-frequency compounds. Consider words that followed the exact same path: on line became on-line and finally online; web site became web-site and finally website; co-operate became cooperate Less friction, more output..
The "e-" prefix (short for electronic) proved particularly prone to closing up. That said, we write ebook, ereader, ecommerce, and elearning without hyphens. Here's the thing — keeping the hyphen in e-mail while dropping it in ebook created an inconsistency that writers and editors found increasingly difficult to justify. The closed form email simply reads faster, reducing cognitive load in a world where we scan text rapidly on screens That alone is useful..
It sounds simple, but the gap is usually here.
Beyond that, the capitalization of the "E" has largely disappeared. But in the early days, E-mail or E-Mail was common because the "E" stood for a proper noun concept (Electronic). Day to day, as the word became a common noun—like mail or letter—the lowercase email became standard. You would not write E-letter; you write email.
Worth pausing on this one.
The "E mail" (Two Words) Error
While e-mail (hyphenated) is a defensible, albeit dated, stylistic choice, writing e mail as two separate words is almost universally considered an error in modern English.
Writing it as two words suggests a phrase: "an e mail" implies "an electronic mail," treating "mail" as the head noun modified by the adjective "e." But "e" is not a standalone adjective in English; it is a bound morpheme (a prefix) that cannot stand alone. Consider this: you would not say "I sent you an e letter" or "Check your e commerce order. " The two-word version breaks the morphological bond that makes the term a single lexical unit.
If you are editing text and see e mail, it should be corrected to email (preferred) or e-mail (acceptable in conservative contexts) immediately. It reads as a typo or a lack of familiarity with standard digital terminology.
Current Style Guide Recommendations
If you write for a specific publication, organization, or academic institution, you must follow their house style guide. Here is the current landscape for the major authorities:
- AP Stylebook (Associated Press): email (no hyphen, lowercase). Changed in 2011.
- Chicago Manual of Style: email (no hyphen, lowercase).
- MLA Handbook (Modern Language Association): email (no hyphen).
- APA Style (American Psychological Association): email (no hyphen).
- Microsoft Writing Style Guide: email (no hyphen).
- Google Developer Documentation Style Guide: email (no hyphen).
- The Guardian / Observer Style Guide: email (no hyphen).
- The New York Times Manual of Style: email (switched from e-mail in recent years).
- Oxford Style Guide: email (no hyphen).
The only major holdouts for the hyphen tend to be specific scientific or government style guides that update less frequently, or individual corporate style guides that have not been refreshed in a decade. Even in those cases, the trend is irreversible.
Capitalization and Derivatives
Consistency extends beyond the noun itself. Once you adopt email, the derivatives follow suit:
- Verb: I will email you the file. (Not e-mail you or e mail you.)
- Adjective: Email address, email client, email marketing, email list.
- Plural: I received fifty emails today. (The plural is emails; email can be a mass noun—"I have too much email"—but emails is standard for countable messages.)
A common point of confusion is the "E" in acronyms or specific product names. Here's one way to look at it: E-mail might appear in a legacy trademark or a specific product title (e.That's why g. , Windows Live E-mail in older branding). In running text, however, lowercase email is correct.
The "Electronic Mail" Formal Exception
There is one scenario where the two-word phrase electronic mail (fully spelled out) is appropriate: highly formal, legal, or technical definitions where the full term is required for precision.
- Example: "The Electronic Mail Privacy Act governs the interception of electronic mail in transit."
- Example: "The system supports the exchange of electronic mail messages using SMTP."
In these cases, you are not using the common noun email; you are using the formal descriptive phrase. Once the term has been defined, however, subsequent references should use email And that's really what it comes down to..
Regional Variations: British vs. American English
Unlike colour/color or organise/organize, the spelling of email is not a British vs. American English split. Both UK and US English have standardized on the closed, unhyphenated, lowercase form Simple, but easy to overlook..
Historically, British English was slightly more conservative regarding hyphens (preferring co-operate longer than US cooperate), but on this specific term, the major UK dictionaries (Oxford, Cambridge, Collins) and UK publications (The Guardian, The Times, BBC) all align with email. You do not need to adjust this spelling for an international audience.
Common Mistakes to Avoid
Even writers who know the correct spelling often stumble on related mechanics. Watch for these frequent errors:
- Capitalizing mid-sentence: "Please check your Email." -> Incorrect. It is a common noun. Write: "Please check your **email
