Prevent gmail from showing inline images as attachments
Question
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("fake@yourshop.com");
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("myemail@gmail.com");
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
2 answers
solution1
11 ACCPTED 2018-04-16 12:40:15
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
solution2
0 2018-04-16 10:59:28
I have executed your code. It works perfectly: I open the resulting email in gmail, I see the inline image, and I don't see any attachment! This may be due to the library version? I have used the 5.0.5.RELEASE.
If this is not the solution, I guess you may have some uncommon property in your SmtpServer.toJavaMailSender() or in your Gmail settings.
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