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7 Best Free SMTP Servers In 2025, April – [Best Platforms]

1 month ago
by Alam
15 min read
Best Free SMTP Servers

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.

Best Free SMTP Servers

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:

  • Email Sending Limits: Most free SMTP servers have a daily or monthly sending limit. Some allow 100 emails per day, while others offer up to 10,000 emails per month. Choose one that suits your needs.
  • Deliverability Rate: A good SMTP server should ensure high inbox placement instead of sending emails to the spam folder. Look for servers with good IP reputation and email authentication (SPF, DKIM, DMARC).
  • Security & Encryption: Security is important to protect email data. A good SMTP server should support SSL/TLS encryption to protect emails from hackers and Two-factor authentication (2FA) for added security.
  • Integration with Email Clients & Apps: A free SMTP server should be easy to connect with email clients like Gmail, Outlook, Thunderbird, and CRM tools like HubSpot, Mailchimp, or Sendinblue.
  • Speed & Reliability: Some free SMTP servers have delays in email delivery. Check if the server has fast email processing to ensure quick delivery.
  • Spam Compliance & Bounce Handling: A good SMTP service should follow CAN-SPAM and GDPR compliance to prevent blacklisting. Also, it should handle bounced emails efficiently.
  • Analytics & Tracking: Some SMTP servers offer email tracking (open rate, click rate) to help you monitor campaign performance.

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

MailerSend

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

  • MailerSend’s SMTP allows users to send emails quickly without complex configurations and settings.
  • If we talk about businesses, managing multiple brands or product lines, MailerSend allows multiple domains under a single account. 
  • MailerSend is highly optimized for high email deliverability, ensuring that emails don’t end up in spam folders.
  • MailerSend doesn’t just help you send emails, it also enables you to receive and process incoming emails.

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

SendPulse

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

  • By simply entering SendPulse’s SMTP credentials into an email client or app, businesses can start sending emails instantly.
  • You can send emails from different domains while maintaining brand consistency and organization.
  • It uses advanced email authentication protocols like SPF, DKIM and DMARC to verify emails and improve their chances of reaching inboxes.
  • With inbound routing, businesses can automate email handling by setting up rules to process replies, support tickets and form submissions.

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

SMTP2Go

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

  • One of the biggest nightmares for businesses is when their email service goes down! SMTP2Go, ensures quick and sure delivery when sending critical transactional emails like order confirmations, password resets, or invoices.
  • If you’ve ever been frustrated by hourly or daily email sending limits imposed by your ISP or web host, you’re not alone! SMTP2Go servers offer unlimited emails in premium plans and upto 3000 emails in free.
  • SMTP2Go is like tracking a package, but for emails! You’ll know exactly where your email lands, if it was read, or if it bounced.
  • Nothing is worse than crafting the perfect email only for it to land in the spam folder. SMTP2GO ensures your emails get delivered to the inbox, not spam.

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

Mailjet

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

  • With MailJet’s redundant and multi-data center infrastructure, your emails will still be delivered even if there’s a major internet outage.
  • Many SMTP servers come with a restriction, however, MailJet offers you unlimited email packages on paid plans. If you’re a newbie you should go for the free email services.
  • It also helps you troubleshoot email issues and optimize your email campaigns to ensure that your emails directly reach the inbox.
  • Authentication methods like SPF and DKIM are used by MailJet to ensure that your emails don’t land in Spam.

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

Mailtrap

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

  • It comes with 25+ pre-built code snippets for different programming languages and frameworks.
  • Mailtrap automatically authenticates your emails to ensure they pass security checks and land safely in inboxes.
  • Get advanced analytics and 30-day email logs give you deep insights into your email performance.
  • Mailtrap’s powerful RESTful API is designed for bulk emailing without throttling or slow delivery times.

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

Postmark

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

  • It ensures that your emails are delivered in seconds, not minutes, thanks to its globally distributed SMTP servers, Postmark automatically routes your emails to the nearest data center, reducing latency.
  • Supports TLS/SSL to encrypt your SMTP communication, ensuring that your data remains secure from interception or tampering.
  • Lets you attach custom metadata to your emails, such as invoice numbers or customer IDs! This helps organize your email communications.
  • Are you using Laravel, Express, Django or even Craft CMS? If so, then integrating Postmark into your application is as simple as copying and pasting SMTP credentials.

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

Brevo

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

  • Brevo’s SMTP servers are built with a robust email deliverability infrastructure, ensuring that your emails don’t end up in spam folders.
  • It works with WordPress, custom websites and email plugins for smooth integration and no technical skills needed at all! It can simply be set up with just a few clicks.
  • With Brevo, you get real-time email analytics that help you track and optimize your emailing campaigns.
  • Delivery rates, open rates, click-through rates and bounces are easy-to-read reports for quick analysis.

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:

  • For Small Businesses & Personal Use: If you send fewer than 500 emails per day, go for MailSender, MailJet and Brevo. These are easy to use and free, but they have low sending limits.
  • For Email Marketing & Bulk Campaigns: Now, let’s say you need to send thousands of emails for marketing campaigns, use SendPulse Free SMTP. These offer higher sending limits and better email tracking.
  • For Transactional Emails (OTP, Invoices, Notifications): Do you need an SMTP for order confirmations, OTPs, and alerts? Go for MailSender Free Plan, Postmark or MailJet. These are optimized for fast, reliable email delivery.
  • For Developers & Tech-Savvy Users: Now, what if a developer is looking for an SMTP server for apps or websites! Then in that case, the developer should try Brevo Mail, MailJet or MailSender Free SMTP. These offer API access and better integration with web apps.

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.

  • Step 1: Choose a Free SMTP Server Provider >> Pick a free SMTP service from the list mentioned earlier.
  • Step 2: Get SMTP Server Details >> After signing up, the provider will give you these details >> SMTP Host (e.g., smtp.gmail.com) >> SMTP Port >> Username (your email) >> Password.
  • Step 3: Configure SMTP in Your Email Client or App (Gmail) >> Open your email client >> Go to Settings >> Outgoing Mail (SMTP) Settings >> Enter the SMTP host, port, username, and password >> Enable SSL/TLS encryption for security.
  • Step 4: Verify & Authenticate Your Email >> Some SMTP providers require you to verify your email domain using DKIM records in your DNS settings.
  • Step 5: Now, Test Your SMTP Server >> Send a test email to check if it’s working properly >> If you don’t receive the email, check your SMTP settings or spam folder.

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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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