If the GMass buttons have disappeared from your Gmail account in the last 36 hours, it’s likely because Chrome has disabled the GMass extension due to a mistaken permissions change. To fix this, go to Chrome –> Preferences –> Extensions, and re-check the box next to GMass.

Technical Explanation:

On Wednesday evening, we pushed a new version of GMass to the Chrome Web Store, and this version listed “www.dev.gmass.co”, which is our development server, as a website for which the extension required permissions. Because the previous version didn’t request this permission, Chrome may have disabled GMass because of the new permission request. We have now pushed a fix for this to the Chrome Web Store, so that the latest version does not require permissions to our development server.


It’s time to reload Gmail in Chrome, because we just launched the world’s best “send test email” button. That’s a bold claim, I know, given the plethora of email marketing tools in existence. Here is what makes ours the world’s best:
  1. You can use the “Send Test Email” button to send a test to one or many email addresses.
  2. You can do so without leaving the Compose window, making it so you can send a test email, make a change, send another test, make a change, and so on.
  3. Not only can you continuously send tests while making changes, you can also easily check your email without leaving the Compose window, if you’re sending tests to yourself. Just refresh your Inbox to see your test email; the Compose window also stays open.
  4. Personalization works. For example, if you’ve connected to a Google Sheets spreadsheet with 500 addresses including your own, and then you send a test to your own address, that test will include personalization from the spreadsheet.


If you already have GMass installed, just reload Gmail in Chrome to get the update. You’ll notice a better-designed Settings panel also.

I hope this new button makes your workflow more efficient and seamless!

If you’re using GMass to send out mass emails (mail-merge) from your Gmail account, you might also want to ensure that your text is crisp, clear, and grammatically correct. My other Gmail extension, Wordzen, edits, proofreads, and even writes your emails for you. It is also a free Chrome extension, and has a team of English experts behind it.

Like GMass, Wordzen adds a button near the Send button when you compose an email in Gmail. Click it and my team of live, human editors will correct and improve your English in about 10 minutes, 24 hours a day.

Compose your email campaign. Then “Wordzen” it to ensure perfect English. Then “GMass” it to send it!

After reviewing your corrected text, click the GMass button to send it.

While many GMass users send emails in non-English languages, Wordzen is currently available only for emails written in English. In time, I’ll add support for other languages as well.

Download the Wordzen Chrome extension here.

We’ve implemented a concept into the GMass sending engine that software developers call “parallelism”, and in the context of GMass, that means our software can now send multiple mail merge campaigns simultaneously.

Previously if one user sent an email to 500 addresses at 1:43 PM, and another user sent an email to 700 addresses at 1:44 PM, the latter sender would have had to wait a few minutes for the first user’s emails to finish sending before his would begin sending. This behavior was fine when we first launched GMass a couple months ago, but as usage has grown, the frequency at which multiple users would initiate big campaigns within seconds of each other has increased.

By re-architecting our back-end, now both mass email campaigns will begin sending within 30 seconds of hitting the GMass button, and both will run simultaneously. I hope this increase in speed and efficiency leads to even greater user satisfaction!

We’ve just fixed a bug that affected users connecting to a Google Sheets spreadsheet and using personalization.

The bug: If the spreadsheet column names were “FirstName” and “LastName”, and you attempted to personalize your email with {FirstName} and {LastName}, the personalization would fail, resulting in each variable being replaced with a blank.

Cause: This was due to a fault in our code that was pulling the first name and last name from the Gmail Contacts as opposed to the Google Sheets spreadsheet, since non-Sheets users can still personalize emails with {FirstName} and {LastName} if the first and last names are stored with email addresses in your Gmail or Google Contacts.

The fix: The fix has now been deployed, and we have tested and confirmed that personalization with Google Sheets for a mail-merge campaign does now work properly when the column names include “FirstName” and “LastName”.