Email Address Validation

Email addresses imported as Contacts are validated following the RFC822: Standard for ARPA Internet Text Messages.  An email address is validated in parts:

• Email: the whole email address

• LocalPart: the first part of the email address, before the at '@' character, also often known as the Mailbox or Mailbox Name.

• Domain: the second part of the email address, after the at '@' character, consisting of two Labels separated by a period '.'

Email Validation

• Must be composed of both a LocalPart and Domain

• The at '@' character must be between LocalPart and Domain

• Must have only one at '@' character

• May contain more than one period '.'

• Cannot begin or end with period '.'

• Cannot have more than one period '.' consecutively 

LocalPart Validation

• Does not require any period '.'

• Must contain at least 1 character

• May not contain more than 64 characters

• Valid characters are:

  • !"#$%&'*+-/0123456789=?.

  • @ABCDEFGHIJKLMNOPQRSTUVWXYZ^_

  • `abcdefghijklmnopqrstuvwxyz{|}~

• Invalid characters are:

  • ()>@,;:\"[]

Domain Validation

• Requires at least 1 period '.' to separate the two Labels, which are both required

• Must contain at least 3 characters, including period

• May not contain more than 255 characters

• Each Label must contain from 1 to 63 characters

• Valid characters are:

  • -012345678.

  • ABCDEFGHIJKLMNOPQRSTUVWXYZ

  • abcdefghijklmnopqrstuvwxyz