How Smart Senders Build Cold Email Infrastructure That Doesn’t Break

Emails launching from a laptop, one with a verified shield checkmark

What is a Cold Email Infrastructure? Cold email infrastructure refers to the technical foundation that determines whether your emails reach inboxes or get blocked by filters. It includes the domains you send from, DNS authentication, mailbox setup, IP reputation, sending patterns, and the systems that protect your deliverability at scale. It’s also important to understand […]

Best Maildoso Alternative for Email Deliverability: Maildoso vs Aerosend

Maildoso and Aerosend logos on a balanced scale

It’s not news that Maildoso can be highly unreliable. This is because they share IPs among their users, which means that if they make a mistake, you suffer too. That’s one of the reasons why getting a Maildoso alternative is important. To elaborate, shared IPs are bad for cold emailers because you could do everything […]

Cold Email vs Marketing Email Explained

Open envelope with a letter, surrounded by smaller emails and a paper airplane

If you want to send emails to sell your product or services, you’re likely confused between sending a marketing email or a cold email. The cold email vs marketing email debate is quite simple. A cold email is sent to build new connections, and a marketing email is sent to people who specifically opted in […]

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.