what characters are not allowed in email addresses

Characters that are not allowed in an email address include:

• Exclamation mark (!)
• Number sign (#)
• Dollar sign ($)
• Percent sign (%)
• Ampersand (&)
• Tilde (~)

Full Answer

What characters cannot be included in an email address?

The local-part of the email address may use any of these ASCII characters RFC 5322 Section 3.2.3:

• Uppercase and lowercase English letters (a–z, A–Z) (ASCII: 65-90, 97-122)
• Digits 0 to 9 (ASCII: 48-57)
• Characters !#$%&'*+-/=?^_` {|}~ (ASCII: 33, 35-39, 42, 43, 45, 47, 61, 63, 94-96, 123-126)
• Character . ...
• Special characters are allowed with restrictions. ...

What symbols are allowed in an email address?

What symbols are allowed in an email address?

• uppercase and lowercase Latin letters A to Z and a to z.
• digits 0 to 9.
• printable characters ! #$%&’*+-/=? ^_` {|}~
• dot . , provided that it is not the first or last character and provided also that it does not appear consecutively (e.g., John.. [email protected] is not allowed).

Are special characters allowed in email addresses?

A special character cannot appear as the first or last character in an email address or appear consecutively two or more times. The most commonly used special characters are the period (.), underscore (_), hyphen (-) and plus sign (+). Similarly, what special characters are allowed in Gmail address? Special characters

How many characters are allowed in an email?

→ Email. Characters in the local part of an email address. RFC2821 and RFC2822 state clearly that only 7bit ASCII characters are allowed in Internet mail addresses. The following list shows all the ASCII characters and explains whether they can or should be allowed in the local part of a mail address.

What characters are allowed in valid email address?

Valid email address formatAllowed characters: letters (a-z), numbers, underscores, periods, and dashes.An underscore, period, or dash must be followed by one or more letter or number.

What should not be included in email address?

Avoid addresses that include a nickname, hobby, pet's name, or any other personal information. You don't want to showcase something that could lead to discrimination or give a bad impression. And, definitely avoid political, religious, or gender references.

Do and don'ts in email writing?

Here are some of the dos and don'ts of email etiquette.Do have a clear subject line.Don't forget your signature.Do use a professional salutation.Don't use humor.Do proofread your message.Don't assume the recipient knows what you are talking about.Do reply to all emails.Don't shoot from the lip.More items...•

What is an unprofessional email address?

E-mail names deemed unprofessional included: alliecat@, bacardigirl@, bighotdaddy@, drunkensquirl@, foxylady@, gigglez217@. Those e-mails considered professional received higher ratings of success than unprofessional names, which correlated better with ethical caring, popular fun and masculinity.

Can you use ASCII characters above U+007F?

In addition to ASCII characters, as of 2012 you can use international characters above U+007F, encoded as UTF-8 as described in the RFC 6532 spec and explained on Wikipedia. Note that as of 2019, these standards are still marked as Proposed, but are being rolled out slowly.

Can quoted forms be rejected?

The quoted forms are rarely used in practice, but are required for some legitimate purposes. Hence, they should not be rejected in filtering routines but, should instead be passed to the email system for evaluation by the destination host.

Question

What are valid and invalid email address characters in Exchange 2010, for example can you have Conan.O'[email protected] is there a document that shows the valid and invalid sysmbols?

Answers

Hi The format of email addresses is local-part@domain where the local-part may be up to 64 characters long and the domain name may have a maximum of 253 characters - but the maximum 256 characters length of a forward or reverse path restricts the entire email address to be no more than 254 characters.<sup id="cite_ref-0">[1]</sup> The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321 - with a more readable form given in the informational RFC 3696<sup id="cite_ref-1">[2]</sup> and the associated errata..

Local part

The local-part of the email address may use any of these ASCII characters RFC 5322 Section 3.2.3:

Domain part

The domain name part of an email address has to conform to strict guidelines: it must match the requirements for a hostname, consisting of letters, digits, hyphens and dots. In addition, the domain part may be an IP address literal, surrounded by square braces, such as jsmith@ [192.168.2.1], although this is rarely seen except in email spam.

All replies

Ask in an Exchange forum, for example similar questions have been asked here:

Local part

The local-part of the email address may use any of these ASCII characters RFC 5322 Section 3.2.3:

Domain part

The domain name part of an email address has to conform to strict guidelines: it must match the requirements for a hostname, consisting of letters, digits, hyphens and dots. In addition, the domain part may be an IP address literal, surrounded by square braces, such as jsmith@ [192.168.2.1], although this is rarely seen except in email spam.

Can a special character be the last character in an email?

A special character cannot appear as the first or last character in an email address or appear consecutively two or more times. The most commonly used special characters are the period (.), underscore (_), hyphen (-) and plus sign (+).

Can a username have an ampersand?

Usernames cannot contain an ampersand (&), equals sign (=), underscore (_), apostrophe ('), dash (-), plus sign (+), comma (,), brackets (<,>), or more than one period (.) Beside above, what characters are not allowed in an email address?