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For details about IMCEA encapsulation, see section 2.1.3.1.8. De-encapsulation SHOULD<108> be attempted only if the domain part of the encapsulated address is recognized as local or otherwise able to deliver mail to the de-encapsulated address.
An IMCEA-encapsulated SMTP address consists of the following six elements:
The literal string "IMCEA" in any combination of uppercase or lowercase letters.
The original address type; one or more ASCII characters.
A literal hyphen character, U+002D.
The encoded original address. Legal characters are uppercase and lowercase ASCII letters, digits, hyphen (U+002D), equal sign (U+003D), underscore (U+005F), and plus sign (U+002B). Any other characters MUST be encoded as a plus sign (U+002B) followed by two hexadecimal digits.
A literal "@" sign, U+0040.
The encapsulation domain, such as "example.com".
To identify an e-mail address as IMCEA-encapsulated, it is sufficient to match elements 1-3.
To obtain the original e-mail address and type from an encapsulated address, use the following procedure:
Copy element 2 to the e-mail address type.
Extract element 4, the encoded e-mail address.
Decode element 4 by replacing any underscore (U+005F) with a forward slash (U+002F), and replacing any sequence of plus sign (U+002B) followed by two hexadecimal digits with the single character that the two hexadecimal digits represent.