How can I set the SMTP message-id while sending mails with javax.mail
. My mail server is reporting something like this:
1 <= [email protected] H=mail (host) [192.168.1.4] P=esmtp S=142014
[email protected]
2 => sombodey@else R=dnslookup T=remote_smtp H=mx00.t-online.de [194.25.134.8]
3 Completed
I want to set the [email protected]
before sending it. Is this possible? The email it created like this:
Properties props = System.getProperties();
props.put("mail.smtp.host", "192.168.1.4");
Session session = Session.getDefaultInstance(props, null);
session.setDebug(false);
Message msg = createMsg();
Transport.send(msg);
I believe this section of the JavaMail FAQ answers your question:
Q: I set a particular value for the Message-ID header of my new message, but when I send this message that header is rewritten.
A: A new value for the Message-ID field is set when the saveChanges method is called (usually implicitly when a message is sent), overwriting any value you set yourself. If you need to set your own Message-ID and have it retained, you will have to create your own MimeMessage subclass, override the updateMessageID method and use an instance of this subclass.
class MyMessage extends MimeMessage { ... protected void updateMessageID() throws MessagingException { setHeader("Message-ID", "my-message-id"); } ... }
According to Oracle's FAQ, when you send the message or call saveChanges, the Message-Id header set by the updateMessageID() method, which overrides any value you might have already set.
To set your own value, you will need to create a sub-class of MimeMessage and implement your own updateMessageID() function:
class MyMimeMessage extends MimeMessage {
...
protected void updateMessageID() throws MessagingException {
setHeader("Message-ID", "my-message-id");
}
...
}
I was able to use this technique to suppress or eliminate the Message-Id header like this:
@Override
protected void updateMessageID() throws MessagingException {
removeHeader("Message-Id");
}
This was useful for Mailgun, which sets the Message-Id themselves if you don't set one.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With