How to encode Internet address

Question

code to send email is following:

    MimeMessage msg = new MimeMessage(session);
    msg.setSubject(\"subject\", \"UTF-8\"); // here you specify your subjec         


        

Answer 1

Email address should follow RFC822 standard

JavaMail's MimeMessage uses InternetAddress:

This class represents an Internet email address using the syntax of RFC822. Typical address syntax is of the form "user@host.domain" or "Personal Name < user@host.domain >".

RFC822 format says:

Note that RFC 822 limits the character repertoire to ASCII. In practice, other characters (such as ä or é) usually work inside quoted strings used for commenting purposes (and comments), but they must not be used in addresses proper.

Personal names for address supports different charsets

InternetAddress uses a personal name:

If the name contains non US-ASCII characters, then the name will be encoded using the specified charset as per RFC 2047. If the name contains only US-ASCII characters, no encoding is done and the name is used as is.

To set charset for encoding, there is a InternetAddress#constructor. Looking at sources:

public InternetAddress(String address, String personal, String charset)
        throws UnsupportedEncodingException {
    this.address = address;
    setPersonal(personal, charset);
}

it just calls setPersonal(..), thus choose the way which is the most convenient for you.

To lookup a charset, use Charset.forName().