Valid email address format
A valid email address format typically consists of the following components:
- Local part: The part before the
@symbol, which can contain letters, numbers, and special characters (except for spaces and punctuation marks). The local part is usually limited to 64 characters. - @ symbol: The
@symbol separates the local part from the domain. - Domain: The part after the
@symbol, which is usually a domain name or an IP address. The domain is usually limited to 253 characters.
Here are some examples of valid email address formats:
[email protected](local part:john.doe, domain:example.com)[email protected](local part:jane_smith, domain:example.net)[email protected](local part:user123, domain:example.io)[email protected](local part:info, domain:example.co.uk)
Some additional rules to keep in mind:
- The local part can contain letters (a-z, A-Z), numbers (0-9), and special characters (such as
!,#,$,%,&,*,+,-,=,^,_,{,},|,~,.). - The domain can contain letters (a-z, A-Z), numbers (0-9), and special characters (such as
-,.). - The
@symbol must be present. - The email address cannot contain spaces or punctuation marks (except for the
@symbol). - The email address cannot exceed 254 characters (including the
@symbol and the domain).
Here are some examples of invalid email address formats:
john [email protected](contains a space)jane.smith@example(missing domain extension)[email protected](contains an exclamation mark in the local part)info@example(missing domain extension)
It's worth noting that while these are the general guidelines for valid email address formats, some email providers or systems may have additional or stricter requirements.