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The ideal email copy length is between 50 to 125 words. Email copy between 50 to 25 words typically results in response rates over 50%. Don't make it too short, though. An email with 25 words may perform the same as messages with 500 to 2000 words, averaging a response rate of less than 45%.
A valid email address consists of an email prefix and an email domain, both in acceptable formats. The prefix appears to the left of the @ symbol. The domain appears to the right of the @ symbol. For example, in the address [email protected], "example" is the email prefix, and "mail.com" is the email domain.
...the upper limit on address lengths should normally be considered to be 256. (Source: RFC3696.)
Character Limitations in an Email Address The total length of an email address in the original standard was 320 characters. The standard limited the username to 64 characters and the domain name to 255 characters.
The shortest valid email address may consist of only two parts: name and domain.
name@domain
Since both the name and domain may have the length of 1 character, the minimal total length resolves to 3 characters.
well the problem is really the question.. email depends on if it is sent over the internet, or within a closed system (eg intranet). over the internet, I believe [email protected] is the shortest email possible (e.g. google's G.CN for china would result in the shortest email adress possible, e.g. [email protected], which is 6 characters long). on the intranet however, it is an entirely different thing, and i@y would be possible, which is just 3 characters long.
I believe the standard you are looking for is RFC 2822 - Internet Message Format
More specific info on email address restrictions in RFC 3696 - Section 3
To quote the spec:
Contemporary email addresses consist of a "local part" separated from a "domain part" (a fully-qualified domain name) by an at-sign ("@").
So three characters is the shortest.
I originally got this info from Phil Haack's blog post.
Many mail-servers will not accept the email-address if there aren't at least 2 characters before the @. That doesn't make it an invalid address, but if the servers don't know that, it sure can lead to a lot of problems.
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