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My application has to send a textfile, which it first has to generate as a String. The text contains non-ASCII symbols, so i would like it to be UTF-8. I've tried a lot of variants, but all i receive as the attachment is some question marks. And, when i send the same text as the message body, it works all right. Here is the line of code that generates the MimeBodyPart with the attachment: String attachment = "Привет"; messageBodyPart.setContent(new String(attachment.getBytes("UTF-8"), "UTF-8"),"text/plain; charset=UTF-8"); I also tried using the string without any transformations, using just the bytes, now, as you see, i am trying to generate a string from the bytes... What am i doing wrong? (And i do remember doing this in another project, which works, but i no longer have the access to its source code). Thank you in advance. Timofey. UPDATE Having read your replies, and after some more unsuccessful experimenting i thought it best to publish the code of my mailing thing. I have the Mailer class, which does the mailing, and other classes can just call its static sendMessage() method to send a message. And it all runs on Google App Engine. public static void sendMessage(String to, String subject, String msgBody, String attachment) throws AddressException, MessagingException { Properties props = new Properties(); Session mailSession = Session.getDefaultInstance(props, null); Message msg = new MimeMessage(mailSession); String email = "bla-bla-bla"; // userService.getCurrentUser().getEmail(); msg.setFrom(new InternetAddress(email)); msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); InternetAddress[] addresses = { new InternetAddress("bla-bla-bla") }; msg.setReplyTo(addresses); msg.setSubject(subject); Calendar cal = Calendar.getInstance(); String fil

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