Gmail now has 1.5 billion users worldwide, the service announced on Friday in a tweet.

It already was in a class by itself, eons ahead of Yahoo Mail and Microsoft Outlook. Now it is even more so.

“t should surprise no one that they are as big as they are as most ecommerce and other vertical lists are comprised of over half being Gmail addresses,” says email veteran Ryan Phelan. “Just like the industry’s push for mobile responsive emails to accommodate mobile users, Gmail now becomes the ISP to consider in the baseline for your deliverability efforts.”

Phelan cautions that other ISPs are also important. But Gmail “just became the standard,” he says. “That means continued education on Gmail standards for  a substantial ‘better than legal’ mailing practice along with engagement- based segmentation practices.  It’s time for marketers to make sure you are learning deliverability guidelines to protect your mail! 

In other news of interest to Gmail users, the service is offering its add-ons via the its G Suite Marketplace.

“In order to streamline the add-on discovery experience for users and to facilitate add-ons publication, we are phasing out publication of add-ons to the Chrome Web Store,” Gmail says in a post. “Once this process is completed, the G Suite Marketplace will be the sole add-on store; Chrome extensions will continue to be presented in the Chrome Web Store and are unaffected by this change.”

9to5 Google reports that both options will be available up to January 25, then the extensions will be available only through the G Suite Marketplace. It adds that commercial customers can manage G Suite Marketplace usage “directly from the G Suite Admin Console.”