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How to send an email to multiple recipients in Spring

The email gets sents only to the last email address in the String[] to array. I’m intending to send to all email addresses added to the array. How can I make that work?

public void sendMail(String from, String[] to, String subject, String msg, List attachments) throws MessagingException {

    // Creating message  
    sender.setHost("smtp.gmail.com");
    MimeMessage mimeMsg = sender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(mimeMsg, true);
    Properties props = new Properties();
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "425");

    Session session = Session.getDefaultInstance(props, null);

    helper.setFrom(from);

    helper.setTo(to);

    helper.setSubject(subject);
    helper.setText(msg + "<html><body><h1>hi welcome</h1><body></html", true);

    Iterator it = attachments.iterator();

    while (it.hasNext()) {
        FileSystemResource file = new FileSystemResource(new File((String) it.next()));
        helper.addAttachment(file.getFilename(), file);
    }

    // Sending message  
    sender.send(mimeMsg);
}

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Answer

You have the choice to use the following 4 methods. I have provided examples of the two methods useful in this case. I have consolidated this information from the commentators below.

helper.setTo(InternetAddress.parse("email1@test.com,email2@test.com"))
helper.setTo(new String[]{"email1@test.com", "email2@test.com"});

From the Javadoc:

enter image description here

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