function EncodeAddressItem(
    EmailAddr: TIdEmailAddressItem; 
    const HeaderEncoding: Char; 
    TransferHeader: TTransfer; 
    MimeCharSet: string; 
    AUseAddressForNameIfNameMissing: Boolean = False
): string;

string - The encoded EMail address in Name and Address format.

EncodeAddressItem is a String function that converts the EMail address in EMailAddr to an encoded string representation using the encodings and character set specified in the parameters to the function. Encoding is performed using the EncodeHeader function when the email address contains characters not representable in the US-ASCII character set. 

The return value for EncodeAddressItem is a string that represents the EMail address and optional name from EMailAddr. When EmailAddr contains the optional name, the return string contains data in the following format:

example missing. 

The special characters '\' and '"' in the email address will be quoted using the '\' character.