Email Newsletters with Google Apps Script

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Published in: Gmail - Google Apps Script

This Google Script sends a daily newsletter containing a summary of your Starred e-mails in Gmail. You can extend it to attach other information like RSS feeds, summary reports, etc.

var LABEL = "STARRED";
var TOTAL = 10;

function Install() {
    ScriptApp.newTrigger("readStarredMessages").timeBased().everyDays(1).create();
}

function readStarredMessages() {

    var thread, subject, link, body, from,
        date, html, emails, color, index = [],
        i;

    var mySheet = SpreadsheetApp.getActiveSpreadsheet();

    emails = GmailApp.search("label:" + LABEL);
    var count = emails.length;

    if (count == 0)
        return;

    if (count > TOTAL)
        index = getIndex(TOTAL, 0, count);
    else {
        for (i = 0; i < count; i++)
            index.push(i);
    }

    for (i = 0; i < TOTAL; i++) {

        var n = index[i];

        if (emails[n]) {

            thread = emails[n].getMessages()[0];

            subject = thread.getSubject();
            body = processHTML(thread.getBody(), 250);
            link = thread.getId(); // can also use GetPermalink()
            from = thread.getFrom();
            date = Utilities.formatDate(thread.getDate(),
                Session.getTimeZone(), "MMM dd, yyyy");

            if (i % 2 == 0) color = "#f0f0f0";
            else color = "#f9f9f9";

            html += "<p>On " + date + ", <i>" + from + "</i> wrote: ";
            html += "<strong>" + subject + "</strong><br /><br />";
            html += body + " <a href='https://mail.google.com/mail/#all/";
            html += link + "'>Click to read &raquo;</a></p>";
        }
    }

    html += "<p><a href='" + SpreadsheetApp.getActiveSpreadsheet().getUrl();
    html += "'>click here</a> and choose Gmail &gt; unsubscribe.</p> ";

    GmailApp.sendEmail(Session.getActiveUser(),
        emails.length + " pending messages in Gmail", "", {
            htmlBody: html
        });
}

// Pick random messages from the Gmail label

function getIndex(count, min, max) {
    var results = [],
        index;
    while (count > 0) {
        randNumber = Math.round(min + Math.random() * (max - min));
        if (results.indexOf(randNumber) == -1) {
            results.push(randNumber);
            count--;
        }
    }
    return results;
}

// Remove HTML tags from the Gmail messages

function processHTML(html, count) {
    html = html.replace(/<(?:.|\n)*?>/gm, '');
    html = html.replace(/^\s+|\s+$/g, '');
    return html.substring(0, count);
}
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Published in: Gmail - Google Apps Script

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Web Geek, Google Developer Expert
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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

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