To embed images such as a logo in your e-mail message, you may use HTML code instead of plain text. Upload your image to Google Drive, retrieve, and use that file ID in code:
function sendEmail(){ var sheet = SpreadsheetApp.getActiveSpreadsheet() .getSheetByName("Form Responses 1"); var lastRow = sheet.getLastRow(); var lastCol = sheet.getLastColumn(); var data = sheet.getRange(lastRow,1,1,lastCol).getValues()[0]; var image = DriveApp.getFileById("[[image file's id in Drive ]]").getBlob(); var to = "[[Recipient email id ]]"; var message = '<img src="cid:logo" />'; message += "<p>Name: " + data[1] + "</p>"; message += "<p>Phone: " + data[2] + "</p>"; message += "<p>Question: " + data[3] + "</p>"; MailApp.sendEmail( to, "Chapter 3 inline image example", "", { inlineImages:{ logo:image }, htmlBody:message } ); }