Domain contains illegal character in string - Java Mail

Question

In our application we use java mail to send emails. Every thing was working fine until a new requirement has come to send an email to an id which takes the form testUser@em_company.com (The part which causes JavaMail to throw an exception is the fact that email address contains _ in the domain name. (em_company.com).

In our code I'm initializing InternetAddress like :

  //harding coding toAddress for simplicity
 String toAddress = "testUser@em_company.com";
 InternetAddress address = new InternetAddress(toAddress);

After looking in the code (Java Mail 1.4.4)

Class : InternetAddress

Method : private static void checkAddress(String addr, boolean routeAddr, boolean validate) throws AddressException

I see a check which causes this exception :

  if (!(Character.isLetterOrDigit(c) || c == '-' || c == '.'))
        throw new AddressException(
                "Domain contains illegal character", addr);

So the question is, is there any way that we can bypass this check and ask java Mail not to do validation check on domain name.

Maybe [Punycode](https://en.wikipedia.org/wiki/Punycode) would solve your problem. — JimmyB, Sep 29 '15 at 09:35
did you review http://stackoverflow.com/questions/10830770/how-to-encode-internet-address — Frederic Henri, Sep 29 '15 at 09:36
Can you use the non-strict constructor: `InternetAddress address = new InternetAddress(toAddress, false);`? — Phylogenesis, Sep 29 '15 at 09:40
non-strict doesn't work internally it calls this(address) first. — jithin iyyani, Sep 29 '15 at 09:48
@FrédéricHenri the link speaks more about username and its encoding but my major concern is with domain name having underscore. — jithin iyyani, Sep 29 '15 at 09:52

zdenda.online · Accepted Answer · 2015-09-29T09:57:46.737

It is kinda weird requirement...Domain name generally contains only letters, digits, dash or dot characters (see here).

Anyway, InternetAddress class has secondary constructor that takes second boolean parameter strict which enforces RFC822 syntax. But it calls first constructor with the check anyway so it is not working as expected.

InternetAddress address = new InternetAddress("testUser@em_company.com", false);

// from API sources:
public InternetAddress(String address, boolean strict) throws AddressException {
   this(address); // THIS CAUSES EXCEPTION ANYWAY
   if (strict) {
      if (isGroup())
         getGroup(true);    // throw away the result
      else
        checkAddress(this.address, true, true);
   }
}

So the only solution that comes on my mind after code investigation is this one but you have to try it out:

InternetAddress address = new InternetAddress();
address.setAddress("testUser@em_company.com");

Unfortunately with this code you lose all parsing logic of InternetAddress. But if you want to use this class only to conform Java Mail API, this may be the way to go.

thank you that worked. Also had to set java property "mail.mime.address.strict", false. Thank you for your time :) — jithin iyyani, Sep 29 '15 at 11:06

score 0 · Answer 2 · answered Sep 29 '15 at 10:08

0

You can also try this:-

String addressString="ars.kov@gmail.com";
String personalString="??????? ?????????";
InternetAddress address=new InternetAddress(addressString,personalString,"UTF-8");

answered Sep 29 '15 at 10:08

Chetan chadha

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score 0 · Answer 3 · answered Aug 10 '17 at 12:17

0

I had the same issue, I was using postman Post call :

I set parameter as key=recipient value='abc@gmail.com'

It started working after removing single quotes from the value. e.g. value=abc@gmail.com

answered Aug 10 '17 at 12:17

S'chn T'gai Spock

1,203
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Domain contains illegal character in string - Java Mail

3 Answers3