The SendHustle blog
Guides and tutorials on email automation, cold outreach, mail merge, and getting more replies.
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Cold Email Deliverability: How to Land in the Inbox, Not Spam
You can write the perfect email, but if it lands in spam it never gets read. Here's how authentication, sending pace, list hygiene, and content decide your deliverability — and how to stack the odds.
Follow-Up Sequences That Stop the Moment Someone Replies
Most replies come from the follow-up, not the first email. But nothing burns trust faster than "just bumping this" after someone already answered. Here's how to build sequences that stop themselves.
Personalization at Scale: Merge Tags, Fallbacks, and Spintax
Real personalization is more than {FirstName}. Learn how merge tags, fallback helpers, and spintax let you write one campaign that reads like a thousand individual emails.
How Many Emails Can You Send From Gmail Per Day?
Gmail and Google Workspace cap how many emails you can send per day — and blowing past the limit can get your account throttled or flagged. Here are the real numbers and how to send safely at scale.
Open & Click Tracking in Gmail: What's Real and What's Not
Open rates can lie. Between image proxies and machine prefetching, here's how email tracking actually works, which numbers to trust, and how SendHustle attributes opens, clicks, and replies.
The 5 Best Mailmeteor Alternatives (No Limits, Better Features)
The best Mailmeteor alternatives when you need higher sending limits, better deliverability, and a more professional feature set.
How to Get Text Alerts for Replies to Your GMass Campaign
How to set up text alerts so you're instantly notified via SMS when someone replies to your GMass campaign.
How to Send a GMass Campaign in Each Recipient's Time Zone
How to set up a Google Sheet and GMass so each recipient gets your campaign at a specific time in their home time zone.
Refer a Friend to GMass (Yes, We Pay You)
You're probably already referring friends, coworkers, and clients to GMass. Here's how to make sure you get credit so we can pay you.
How Email to SMS Works in 2026 (Plus: 5-Minute Setup?)
Email to SMS has changed in 2026, but it's still something you can pull off and get set up in a matter of minutes. Here are the options and more.
Upcoming Changes to GMass Pricing (Jan 2026)
GMass turned 10 this year, and in that time our users collectively sent more than 9 billion emails. That number ...
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