Xpressnets

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function archiveAllCNAEmails() {
  var domain = "@cna.com";

  // Search Gmail for all emails from or to any @cna.com address
  var threads = GmailApp.search("from:" + domain + " OR to:" + domain);

  // Folder for storing all PDFs
  var folderName = "Gmail PDFs - CNA (All Emails)";
  var folders = DriveApp.getFoldersByName(folderName);
  var folder = folders.hasNext() ? folders.next() : DriveApp.createFolder(folderName);

  for (var i = 0; i < threads.length; i++) {
    var messages = threads[i].getMessages();

    for (var j = 0; j < messages.length; j++) {
      var message = messages[j];
      var sender = message.getFrom();
      var recipient = message.getTo();

      // Only process if either side matches the domain
      if (!(sender.includes(domain) || recipient.includes(domain))) {
        continue;
      }

      var date = Utilities.formatDate(message.getDate(), "GMT", "yyyy-MM-dd");
      var subject = message.getSubject().replace(/[^a-zA-Z0-9 ]/g, '').substring(0, 50);
      
      var direction, contact;
      if (sender.includes(domain)) {
        direction = "FROM";
        contact = sender.match(/<(.+)>/) ? sender.match(/<(.+)>/)[1] : sender;
      } else {
        direction = "TO";
        contact = recipient.match(/<(.+)>/) ? recipient.match(/<(.+)>/)[1] : recipient;
      }

      var filename = `${date} - ${direction} ${contact} - ${subject}.pdf`;

      var blob = Utilities.newBlob(message.getBody(), "text/html", filename).getAs("application/pdf");
      folder.createFile(blob);
    }
  }
}