Send HTML email with plain text fallback via Gmail API

Question

An answered question at StackOverflow suggests that adding html-markup to the body of the email will do the trick. Is that solution correct?

But what if the recipien

Answer 1

To add an update to above answer from Throlle. There were some differences in above and possibly with the later versions of gmail api

to send a message and follow their default provided standards for sending a standard email :

This is in grails but you can easily change for java, the controller stuff pre this html stuff can be found here. Maybe when I am finished with what I am doing and get a chance will update the github site with all these examples:

In controller:

  def sendHTMLEmail() {
        String emailBox='me@gmail.com'
        String to ='someuser@domain.com'
        String html="
aa
bb
html content
"
        MimeMessage content = gmailService.createHTMLEmail(to,emailBox,'gmail test','testing gmail via app',html)
        def message = gmailService.sendMessage(gmail,'me',content)
        render "=== ${message.id}"
}

In Service:

public static MimeMessage createHTMLEmail(String to, String from, String subject, String text, String html) {
        Properties props = new Properties()
        Session session = Session.getDefaultInstance(props, null)

        MimeMessage email = new MimeMessage(session)
        Multipart multiPart = new MimeMultipart("alternative")
        email.setFrom(new InternetAddress(from))
        email.addRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(to))
        email.setSubject(subject)

        MimeBodyPart textPart = new MimeBodyPart()
        textPart.setText(text, "utf-8")

        MimeBodyPart htmlPart = new MimeBodyPart()
        htmlPart.setContent(html, "text/html; charset=utf-8")

        multiPart.addBodyPart(textPart)
        multiPart.addBodyPart(htmlPart)
        email.setContent(multiPart)
        return email
    }

Then their standard provided sendMessage (below bits can be found on github link):

public static Message sendMessage(Gmail service,String userId,MimeMessage emailContent) throws MessagingException, IOException {
        try {
            Message message = createMessageWithEmail(emailContent)
            message = service.users().messages().send(userId, message).execute()
            return message
        } catch (Exception e) {
            //log.error "${e}"
        }
    }

and createMessageWithEmail

public static Message createMessageWithEmail(MimeMessage emailContent) throws MessagingException, IOException {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream()
        emailContent.writeTo(buffer)
        byte[] bytes = buffer.toByteArray()
        String encodedEmail = Base64.encodeBase64URLSafeString(bytes)
        Message message = new Message()
        message.setRaw(encodedEmail)
        return message
    }