I am using the spring samples to send inline images. It works but gmail shows images also as attachments. How to avoid it?
The code is pretty simple.
public class Email {
public static MimeMessagePreparator getContentAsInlineResourceMessagePreparator(final String to) {
MimeMessagePreparator preparator = new MimeMessagePreparator() {
public void prepare(MimeMessage mimeMessage) throws Exception {
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");
helper.setSubject("Email with inline image");
helper.setFrom("[email protected]");
helper.setTo(to);
String content = "Dear pedrofb...";
helper.setText("<html><body><p>" + content + "</p><img src='cid:company-logo'></body></html>", true);
helper.addInline("company-logo", new ClassPathResource("logo.png"));
}
};
return preparator;
}
public final static void main (String argv[]){
//Basic SMTP configuration
JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
mailSender.setHost(host);
mailSender.setPort(port);
MimeMessagePreparator preparator = getContentAsInlineResourceMessagePreparator("[email protected]");
mailSender.send(preparator);
}
}
My question is similar to How to stop embedded images in email being displayed as attachments by GMail? but the answer is very old and it does not show how to configure spring properly. I do not want to build the message parts&headers myself
Posted the raw message in pastebin
The issue is with MimeType determination
The png extension is treated as image/x-png instead of image/png this causes the issue with Gmail. This has been fixed/changed in 5.X and may also be in some 4.X later version also (I am not sure on those). But the fix is quite easy. Change
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");
to
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8") {
@Override
public void addInline(String contentId, Resource resource) throws MessagingException {
Assert.notNull(resource, "Resource must not be null");
String contentType = this.getFileTypeMap().getContentType(resource.getFilename());
contentType = contentType.replace("x-png", "png");
this.addInline(contentId, resource, contentType);
}
};
And it will override the MimeType to image/png
