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Email Address Validation

Email addresses imported as Subscribers 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
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