Parse Bounced Email Messages in Gmail with Google Scripts

P
Published in: Gmail - Google Apps Script

The Google Script scans your Gmail mailbox for messages from mailer-daemon@gmail.com and prepares a bounce email report logging the failed deliveries in a Google Spreadsheet. See sample Gmail bounce report

function getBouncedEmails() {

    /* Written by Amit Agarwal */
    /* Email: amit@labnol.org  */

    // Write the bounced email report to a Google SpreadsheetApp
    var sheet = SpreadsheetApp.getActiveSheet();
    sheet.getRange(2, 1, sheet.getLastRow(), sheet.getLastColumn()).clearContent();

    // Find all emails returned via Gmail Mailer Maemon
    var query = "from:(mailer-daemon@google.com OR mailer-daemon@googlemail.com)";

    // Get the most recent 500 bounced email messages in Gmail
    GmailApp.search(query, 0, 500).forEach(function(thread) {
        thread.getMessages().forEach(function(message) {
            if (message.getFrom().indexOf("mailer-daemon") !== -1) {
                var body = message.getPlainBody();
                // Get the bounced email address from the body
                var matches = body.match(/Delivery to[\s\S]+?(\S+\@\S+)\s([\s\S]+?)----- Original Message/);
                if (matches) {
                    // Get the exact reason for the email bounce
                    var reason = matches[2].match(/The error.+:\s+(.+)/) || matches[2].match(/Technical details.+:\s+(.+)/);
                    if (reason) {
                        // Save the data in a Google Spreadsheet
                        sheet.appendRow([
                            thread.getLastMessageDate(),
                            matches[1],
                            reason[1].replace(/ (Please|Learn|See).*$/, ""),
                            thread.getPermalink(),
                            thread.getFirstMessageSubject()
                        ]);
                    }
                }
            }
        });
    });
}
📮  Subscribe to our Email Newsletter for Google tips and tutorials!
Published in: Gmail - Google Apps Script

Looking for something? Find here!

Meet the Author

Web Geek, Google Developer Expert
A
Amit Agarwal

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India. He is the developer of Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

Get in touch

Google Add-ons

Do more with your Gmail and GSuite account
G

We build bespoke solutions that use the capabilities and the features of Google Workspace for automating business processes and driving work productivity.

  1. Mail Merge with Attachments
    Send personalized email to your Google Contact with a Google Sheet and Gmail
  2. Save Emails and Attachments
    Download email messages and file attachments from Gmail to your Google Drive
  3. Google Forms Email Notifications
    Send email notifications to multiple people when a new Google Form is submitted
  4. Document Studio
    Create beautiful pixel perfect documents merging data from Google Sheets and Google Forms
  5. Creator Studio for Google Slides
    Turn your Google Slides presentations into animated GIFs and videos for uploading to YouTube