[Solved] How to get preview of the email body

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I’m not sure if I understand you correctly but in case you just want to get the first 255 characters of an existing string you can use:

String message; //String that holds your message
String previewMessage = ""; //String to store your pewview message

if(message.length() >= 255) {
  previewMessage = message.substring(0, 254);
}

solved How to get preview of the email body