What are Gmail’s Daily Email Sending Limits per day in 2026?

Speedometer at the redline zone with a counter display and stop sign

Gmail is the most popular provider. But should you use it for cold email? If you’ve found yourself in the midst of the “you have reached a limit for sending mail Gmail” notification, you’ve likely reached the Gmail sending limit. Gmail sending limits are 2000 on paper. For cold emailers, it’s 25 per inbox. A […]

Best Time to Send Email Blast: Does It Even Matter?

Clock face with highlighted hours, a calendar with pins, and a timeline

Most people ask about the send time after they’ve done the hard work. Copy is ready, offer is dialed in, list is built. It feels like the last piece of the puzzle. It isn’t. Send time is one of the weakest levers in cold email. Your offer, your targeting, and your technical setup will determine […]

Best Subject Lines for Cold Emails Guide

Pen writing on a line with sparkle stars and a bullseye target

Do Subject Lines Even Matter? (The Honest Answer) If you’re on the hunt for the best subject line for cold emails, here are some hard-hitting facts from someone who’s been in the business for a while: Subject lines don’t matter nearly as much as you think. Yep, it’s true. To make it even clearer, if […]

Coming Soon
SPF/DKIM/DMARC Checker Soon

Validate your email authentication

Blacklist Checker Soon

Check if your domain or IP is blacklisted

Email Spam Checker Soon

Test if your email lands in spam

How to Get Your Instantly API Key
Step 1 : Log in to Your Instantly Account
Go to https://app.instantly.ai/auth/login and log in to your account
Step 2 : Navigate to Settings

Click on your profile icon in the bottom-left corner, then select “Settings” from the dropdown menu.

Step 3 : Select Integration

In the Integrations page, click on the “API Keys” tab in the left sidebar.

Step 4 : Get Your API Key with all:read Scope

If you already have an API key with the all:read scope, you can use that key.


If not, click the “Create API Key” button, select the all:read scope, and make sure to save your new API key somewhere safe.

How to Get Your Smart Lead API Key
Step 1 : Log in to Your Smart Lead Account
Go to https://app.smartlead.ai/login account and log in to your account
Step 2 : Navigate to Settings

Click on the “Settings” option in the top right corner profile icon.

Step 3 : Select API Integration

In the Settings page, under your profile picture, you can see the SmartLead API Key.

Step 4 : Generate Your API Key

If you already have an API key displayed, you can use that key. If not, click the “Generate API Key” button to create a new one.