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When I started GMass almost six years ago, it was just a simple extension for Gmail that let you send a few personalized emails at the click of…
GMass Blog
Email, Gmail, and GMass — explained.
Practical guides, product updates, deliverability research, and experiments from the team building GMass.
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How we’re working around India’s RBI recurring payments rule
If you live in India and use an Indian credit card to subscribe to software and other services, you’ve likely had trouble making payments lately because of the…
New Feature: The Gate
As of March 2023, The Gate has been deprecated and replaced by The Reply Project, GMass’s tool to make replying to emails 10x faster. (Which incorporates everything from…
New Feature: Sentiment Analysis on Replies
You send out a cold email campaign, a bunch of people reply, and now your inbox is flooded with replies. Yay! Some people want more information, some people…
Sender Reputation Guide: How to Check & Boost It
Did you know that your sender reputation affects the deliverability of your marketing and transactional emails? If you have a poor sender reputation, your emails will probably end…
Introducing a New Kind of SMTP Service (Transactional Emails in Gmail)
If you have a website, app, or blog, you’ve likely connected to a transactional email service through a transactional email API or an SMTP service. Popular SMTP services…
Is Cold Emailing Illegal? (US, EU, UK, Canada, Australia Laws)
Is cold email illegal? The short answer is no; cold emailing isn’t illegal. However, based on where you are, you’ll need to comply with anti-spam laws like the…
Cold Email vs Spam: 5 Key Differences + 7 Handy Tips (2026)
Cold email vs spam is a worthwhile debate, though there’s a definitive answer. No, cold email is not spam. But if you have the wrong approach to cold…
Cold Email vs Cold Call: 6 Key Differences (2026 Guide)
The cold email vs cold call debate continues, with some arguing that cold calling is a technique that firmly belongs in the past. Despite that, there are still…
Guide to using the Zapier integration
You can now use the Zapier integration for GMass. Give me the link! First, you’ll need to create an API key in GMass (login required). Then, go here…
Use our tools to fix your spam issue
You’ve determined that emails you send with GMass are going to the Spam folder or are getting blocked. You’ve already taken these steps to determine that GMass is…
Guide to using webhooks
GMass now supports webhooks for the following types of events: Sends Opens Clicks Replies Unsubscribes Bounces What’s a webhook? There’s plenty of information about webhooks on the web…