gmailScript.js

// A better version of this script: https://pixelbakery.com/recipes/gmail-automatically-delete-or-archive-emails
// Enhancements by Kris Linquist:
//   - Uses gmail's search feature to automatically return emails older than a date rather than returning
//     all mail and comparing the date of the email
//   - Loops until there are no more results - gmail's API only returns 500 emails at a time.


function autoDelete() {
    var deleteEmailsOlderThanDays = 3;
    var deleteEmailsWithThisLabel = 'GitHub';

    function getDateBeforeToday(daysBefore) {
        let today = new Date();
        // Subtract the specified number of days
        today.setDate(today.getDate() - daysBefore);
        // Extract year, month, and day
        let year = today.getFullYear();
        let month = today.getMonth() + 1; // Months are zero-based
        let day = today.getDate();
        // Format month and day with leading zero if needed
        month = month < 10 ? '0' + month : month;
        day = day < 10 ? '0' + day : day;
        // Return the formatted date
        return `${year}/${month}/${day}`;
    }

    console.log('Started autoDelete run.');
 
    var query = `label:${deleteEmailsWithThisLabel} before:${getDateBeforeToday(deleteEmailsOlderThanDays)}`
    var threads;
    var counter = 0;
    var errors = 0;
    do {
        Logger.log(`Searching with query ${query}`)
        threads = GmailApp.search(query);
        if (threads.length > 0) {
            console.log('Found ' + threads.length + ' emails marked for deletion.');
            try {
                for (var i = 0; i < threads.length; i++) {
                    try {
                        threads[i].moveToTrash();
                        Logger.log(`Deleted email: ${threads[i].getFirstMessageSubject()} with date ${threads[i].getLastMessageDate()}...`);
                        counter++;
                    } catch (e) {
                        Logger.log(`Error moving thread to trash: ${threads[i].getFirstMessageSubject()}`);
                    }
                }
            } catch (e) {
                errors++;
                console.error(`Could Not Complete Run: ${e}`);
            }
        } else {
            console.log('No emails marked for deletion. Exiting.');
        }
    } while (threads.length > 0);
    console.log(`Successfully moved ${counter} emails to the trash with ${errors} errors.`);
}