Have you ever found yourself irritated with email delivery issues?
Let’s say you’re a digital marketer wanting high email deliverability, a salesperson needing quick outreach, or a business owner looking for cost-effective email solutions! In that case, the best SMTP server can be your best friend.
You might’ve seen that for business purposes emails are used at a higher scale and ensure professional outreach. They’re powerful tools for engagement, marketing and customer communication.
But here’s the best part! Not all emails reach inboxes.
If you’re sending bulk emails or let’s say transactional notifications (like OTP messages, verification link text), you will definitely need the best free SMTP server to ensure smooth, secure and fast email delivery.
This article is crafted specifically for anyone who depends on email for their business or communication needs. Let’s say you’re running an online startup, an e-commerce store, a blog, or an enterprise, you should know how free SMTP servers work and how they can save you both time and money.
To make your life easier, we’ve listed the top 7 free SMTP servers that help different types of users from beginners to professionals. By the end of this article, you’ll know which SMTP service is the best for your needs and how to boost your email strategy.
So, let’s get into it right away and find the perfect SMTP solution!
What is an SMTP Server?
Absolutely the first question that comes to mind, what is actually an SMTP Server?
Understand! An SMTP server also called Simple Mail Transfer Protocol server is like a digital post office that helps you send and receive emails using the internet. So, whenever you send an email, the SMTP server processes it, finds the receiver’s email server and ensures the email reaches the inbox.

It’s like when you hit the SEND button to send an email, your email client like Gmail, Outlook connects to an SMTP server. The SMTP server then processes the email. It checks the sender’s email, the recipient’s email and the content. It finds the receiver’s server. The SMTP server looks up where the recipient’s email is hosted.
Email delivery happens if everything is correct, the receiver’s email provider like Yahoo, Gmail, or a business domain, receives the email and places it in the inbox.
Specially for bulk email marketing, business communication and better inbox placement marketers and salespeople use SMTP servers to send promotional emails, newsletters, and offers. Businesses can also send invoices, OTPs and customer notifications.
SMTP servers are well-optimized to prevent emails from landing in the spam folder.
Now that you know what an SMTP server is, let’s explore the best features to look for when choosing a free SMTP server.
Features to Look for in a Free SMTP Server
Please understand! If you’re looking for a free SMTP server, you should make sure it has the listed features definitely:
7 Best Free SMTP Servers for Email Sending
Now that you know what features to look for, let’s discuss the top 7 best free SMTP servers for email sending in 2025, its features, free plans (if any) and pricing policy as well.
1. MailerSend – Overall Best Email Sending Service

First in the list, we’ve MailerSend which offers cloud-based SMTP and email API service specifically designed to help your businesses send transactional emails with high deliverability.
Let’s say you’re a developer integrating email into an app or a marketer looking for a reliable email-sending solution, then a MailerSend can be the best option as it is an easy-to-use platform with robust features.
Do you know? One of the standout features of MailerSend is its free plan, which allows users to send up to 3,000 emails per month, making it a great choice for startups, small businesses, and individuals.
Key Features
PRICING & PLANS
Free Trial: 3000 emails per month for free
Starting Price: $28 per month (50K+ emails per month)
Premium Price: $88 per month
2. SendPulse – Provide Multi Channel Marketing Automation Platform

Now, if we talk about SendPulse, this platform is designed for easy integration with apps, websites and CRMs through SMTP and API, ensuring quick and reliable email delivery.
SendPulse’s SMTP services are well-optimized for fast performance, ensuring that transactional emails like password resets, order confirmations and notifications, reach inboxes without any delay.
With 99.95% guaranteed uptime, businesses can rely on SendPulse for uninterrupted email communication. So, now that we’ve understood what SendPulse is, let’s explore the top four SMTP features that make it one of the best free SMTP servers available.
Key Features
PRICING & PLANS
Free Trial: Free plan available (15000 emails per month for free)
Starting Price: $8 per month (unlimited number of emails)
Premium Price: $9.60 per month (500MB cloud storage)
3. SMTP2Go – Reliable & Scalable Email Delivering Service

If you’ve ever struggled with emails not getting delivered, ending up in spam, or facing frustrating sending limits, SMTP2GO is here to save the day for you. It’s like a powerful, cloud-based SMTP service that ensures rock-solid email delivery.
Think of SMTP2GO as your email delivery superhero! Keeps your emails flowing smoothly while handling all the complicated backend stuffs like SPF, DKIM, email authentication and blacklists.
Key Features
PRICING & PLANS
Free Trial: Free Plan (Get 1000 emails per month for free)
Starting Price: $15 per month (10K+ emails)
Premium Price: $75 per month (100K+ emails)
4. Mailjet – Easy to Use Platform

Next, we’ve MailJet that ensures zero downtime, so your emails get delivered even during major internet outages. Let’s say you’re sending transactional emails from your app, marketing emails for your business, or simple messages from Outlook, MailJet offers everything you need for perfect email delivery.
If you’re a small business, an enterprise, a developer or even a non-techy entrepreneur, MailJet makes sure your emails reach inboxes fast, reliably, and securely.
Now, let’s dive into the top features that make SMTP2GO an email-sending powerhouse.
Key Features
PRICING & PLANS
Free Trial: Free trials offers 6000 emails per month
Starting Price: $17 per month 15K+ emails per month
Premium Price: $27 per month
5. Mailtrap – Reliable Email Delivery Networks

Maybe you’ve spent hours debugging why your transactional emails aren’t landing in inboxes? Well, say hello to Mailtrap SMTP Service, a perfect solution for seamless, reliable, and super-fast email delivery!
With 25+ ready-to-use code snippets, automatic email authentication, detailed email logs, and advanced analytics, Mailtrap ensures your emails reach the right inboxes without a hitch.
If you’re a developer, marketer, or business owner, Mailtrap has everything you need for bulk emailing and even makes sending emails ridiculously simple.
Key Features
PRICING & PLANS
Free Trial: Get 1000 emails for free per month
Starting Price: $15 per month
Premium Price: $85 per month
6. Postmark – Provide Custom Services

Unlike traditional email providers, Postmark prioritizes transactional emails over bulk marketing emails, meaning your messages won’t get stuck in queues.
With its globally distributed infrastructure, built-in security measures and advanced tracking capabilities, Postmark offers a seamless experience for businesses that need email delivery they can trust.
Getting started is incredibly easy! Since SMTP is a widely supported protocol, you don’t need additional libraries or complex setups. You simply need your Postmark SMTP credentials, add them to your application’s email configuration, and you’re good to go!
Key Features
PRICING & PLANS
Free Trial: Free trial available
Starting Price: $10 per month (10K+ emails)
Premium Price: $60 per month (50K+ emails)
7. Brevo – Best Free Bulk Services

Now, lastly we have Brevo! When it comes to sending bulk emails, having a reliable SMTP server is a must.
That’s where Brevo’s free SMTP servers come into play. Let’s say you’re a business owner, a marketer or someone looking to send transactional emails efficiently, Brevo provides a free and powerful SMTP solution to ensure your emails reach inboxes instead of spam folders.
And the best part? Brevo doesn’t just give you an SMTP server and leave you to figure things out on your own. They offer top-notch deliverability, email analytics, and automation features to ensure your emails perform well.
Key Features
PRICING & PLANS
Free Trial: 3000 emails for free per month
Starting Price: $6.50 per month
Premium Price: $14.11 per month
How to Choose the Best Free SMTP Server for Your Needs?
If you’re wanting to choose the right free SMTP server then you need to consider the top 4 points that help you carry out email campaigning properly. Here’s how you can pick the best one:
Once you have chosen your free SMTP server, the next step is setting it up.
How to Set Up a Free SMTP Server (Step-by-Step Guide)?
Setting up a free SMTP server is really very easy. Here’s how you can do it in just 5 steps.
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FAQs – Best Free SMTP Servers
Can I run my own SMTP server?
Yes, you can run your own SMTP server, but it requires some technical setup. You need a domain, a server, and proper configurations to send emails. Also, you must follow email security rules to avoid getting marked as spam.
How to generate SMTP?
You can generate an SMTP by signing up for an email service provider like MailSender, PostMark, or MailJet. If you want a free SMTP, some web hosting companies also provide it. You’ll usually need to enter your domain details, verify it, and get your SMTP credentials.
Which SMTP is best?
The best SMTP depends on your needs. If you want free SMTP, MailSender and MailJet are good options. If you need bulk email sending, services like PostMark, Brevo and Mailgun work well.
Can I use Gmail as SMTP?
Yes, you can use Gmail as an SMTP server. Google allows you to send emails using their SMTP with some limits. You need to enable “Less Secure Apps” (or use App Passwords) and enter Gmail’s SMTP settings in your email client.
How much does Google SMTP cost?
If you use a free Gmail account, Google’s SMTP is free but has daily sending limits (about 500 emails per day). For higher limits, you can use Google Workspace (formerly G Suite), which starts at $6 per user/month.
Conclusion – Best Free SMTP Servers
By now, you might know that a free SMTP server is great for sending emails without spending money, but it comes with limitations like low sending limits and fewer features.
If you’re using free SMTP servers for email campaigning or for greater outreach, then make sure to choose one provider that offers greater number of emails in free plan, email authentication option like e sign or stamp and cloud storage as well.
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