An email address contains several main parts.
Username
This is the first part of the email address, and this makes the email address unique & personalize.
@ (At Sign)
This separates the Username part from the Host Name section.
Host Name
This part represent the company or the email service provider.
. (dot)
This separates the Host Name from the Top Level Domain.
Top Level Domain
This is the end part of an email address, This part represent what type of company it is or where the server is located.
Valid email addresses
- prettyandsimple@example.com
- very.common@example.com
- disposable.style.email.with+symbol@example.com
- other.email-with-dash@example.com
- "much.more unusual"@example.com
- "very.unusual.@.unusual.com"@example.com
- "very.(),:;<>[]\".VERY.\"very@\\ \"very\".unusual"@strange.example.com
- admin@mailserver1 (local domain name with no TLD)
- #!$%&'*+-/=?^_`{}|~@example.org
- "()<>[]:,;@\\\"!#$%&'*+-/=?^_`{}| ~.a"@example.org
- " "@example.org (space between the quotes)
- üñîçøðé@example.com (Unicode characters in local part)
- üñîçøðé@üñîçøðé.com (Unicode characters in domain part)
Invalid email addresses
- Abc.example.com (no @ character)
- A@b@c@example.com (only one @ is allowed outside quotation marks)
- a"b(c)d,e:f;g<h>i[j\k]l@example.com (none of the special characters in this local part are allowed outside quotation marks)
- just"not"right@example.com (quoted strings must be dot separated or the only element making up the local-part)
- this is"not\allowed@example.com (spaces, quotes, and backslashes may only exist when within quoted strings and preceded by a backslash)
- this\ still\"not\\allowed@example.com (even if escaped (preceded by a backslash), spaces, quotes, and backslashes must still be contained by quotes)
- john..doe@example.com (double dot before @)
- with caveat: Gmail lets this through, Email address#Local-part the dots altogether
- john.doe@example..com (double dot after @)
- a valid address with a leading space
- a valid address with a trailing space
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