10 Best Free SMTP Servers in 2025,Apr – Send 15k eMails/mo
Welcome to our blog! First let’s tell you why you need to read this blog.
Have you ever heard of the best free SMTP servers? Do you even know who all can use it and what benefits free SMTP servers can provide you? Is your answer a big NO! Don’t be stressed! Here, we’re gonna answer you everything about it.
Before we move ahead, Understand this ⬇️
Let’s say you want to send a letter to your friend living far from your location, how do you do that? First you write a letter, then put it in an envelope and drop it in the mailbox. Thereafter, the postman sends your letter to your friend at his address mentioned on the letter, right? Similarly,
SMTP is just like your postman! When you click Send on an email, the SMTP server takes your email and sends it to your friend’s mail server and then finally to the inbox.
To give you a more clear understanding about free SMTP servers, please read it along!
What are Free SMTP Servers?
First, tell me, Do you have a computer at home? Like a computer that has its RAM, built-in CPU, motherboard, and memory card, SMTP servers are like big computer systems with every possible web resource to send emails from one location to another using an internet connection.
So, in a nutshell free SMTP servers refers to zero cost servers that allow an individual to send mails using SMTP protocols. Through the SMTP servers, your mails are sent at a faster rate, without error and securely to your clients.
If you have ever registered your account on Facebook or WhatsApp, you might’ve observed that when you put in your name and cell phone number, they instantly send you an OTP number or a Verification code. You might’ve observed it, right?
Have you ever thought about how it happens? How quickly do they send you the mail right after you put in your details? All thanks to free SMTP servers🙂
Facebook, WhatsApp and other famous websites, like Amazon, use SMTP servers to send users instant code verification messages.
We sincerely hope you understand where SMTP servers are helpful and how it works.
10 Best Free SMTP Servers Services 2025
Let’s now get started with the best free SMTP servers 2025. We’ve also stated the top features and starting price (along with the services).
⏰ TL;DR
1. MailSend – Overall Best Free SMTP Servers
2. SendPulse – Best Free SMTP Servers
3. Brevo – Free SMTP Servers for Marketers
4. Mailjet – Free SMTP Server for High Email Deliverability
5. MailTrap – Free SMTP Servers for Email Testing
6. PostMark – Free SMTP Servers for Fast and Reliable
7. SendGrid – Free SMTP Servers for Scalable Email Sending
8. MailGun – Free SMTP Servers for Developers
9. SMTP2Go – Free SMTP Servers for Reliable Outbound Email Delivery
10. iDealSMTP – Free SMTP Server For Smart Businesses
1. MailSend – Overall Best Free SMTP Servers
Why MailSend? Why is it here as the top best free SMTP servers in 2025? Because MailSend first offers a free trial to help you understand the functionality of this server provider. Second of all, MailSend is completely reliable, offering multiple domains to handle your business.
Let’s tell you about MailSend’s free plan! It allows 3000+ free emails per month, offers drag-n-drop feature along with HTML email editor. This email editor feature helps you customize the message as you want it to be sent to your leads or connections.
You even get to track your emails to know the status of your messages sent. If you are not able to think about the content of your email to be sent, you can make use of highly well-customized email templates with dynamic targeting.
Top Features
- Collaborates with multiple Applications: User Experience increases when everything is integrated under one head. MailSend merges with other apps like Zapier and all for greater work performance.
- 3000 mails per month for Free: If you register for a MailSend account, you get to use a free demo service in which they offer the new users upto 3000 messages per month for free.
- Blacklist unwanted IPs: Scammers really give us a hard time! They unnecessarily call or send emails from identity sources, raising concerns. That’s why MailSend offers this feature.
- Multiple domains: Businessmen do not handle one product. They have multiple domain names for different businesses. MailSend offers this feature helping businesses to excel.
- 3 advanced email builders: If you’re not having your own idea about the email, you can use this feature of MailSend to create a well-customized message template.
Pricing Scheme
- $28 for one month
2. SendPulse – Best Free SMTP Servers
If you have an e-store business where you’re selling your products online, you also should know the fact that when a client books his order online, he gets an order verification code, OTP when making payments and more. If you’re looking for such a feature in which you send SMS or email code just as your client makes the order, then go for SendPulse.
If we talk about its free SMTP service, SendPulse allows you to send around 12000+ emails on a monthly basis, send the messages instantly and also connect your SMTP server to your CMS like for instance WordPress to start sending transactional email right away.
To help you understand SendPulse in a proper manner, we’ve put in bullets a few of its unique features. Let’s check them out!
Top Features
- Track your emails: Keeping an account of the messages sent is really very important. SendPulse provides you a feature to track the number of emails sent, delivered and opened.
- Stops after exceeding Bounce rates: If you send messages to someone who never replies to you at all, it’s really disgusting. This feature immediately stops sending email as the bounce rate exceeds.
- WebHooks for transactional emails: This feature tells you that the moment your email is received or opened by your client, SendPulse will notify you via notification alerts.
- SMTP wordpress Plugin: You can even install SendPulse Plugin in your WordPress in just a single click. This feature allows you to send messages to the clients of your e-store easily.
- Get DKIM signature feature: Your message is authentic only if it contains your identity mark, like your sign. That’s what DMIK signature does, it allows you to make your message authentic before sending.
Pricing Scheme
- $59 for one mont
3. Brevo – Free SMTP Servers for Marketers
300 mails per day is what Brevo free SMTP servers offer you. Let’s learn more about it! Brevo offers top-class email deliverability, which means your emails are sent on time without suffering even a single point of delay.
Brevo also offers free SMTP for testing! If you are a developer, Brevo lets you customize your email campaigns with codes. What else will I find in the free SMTP server of Brevo? They offer you customizable email templates to help you pick the best one for your promotional email campaigns, drag-n-drop editor, multiple app integrations and much more to help you enhance the business performance.
Top Features
- Personalized emails: Are you creative? If yes, then Brevo gives you an opportunity to customize your email content and its look in order to scale your business and get more conversions.
- Free SMTP plugins: If you’re running a WordPress website, you can easily connect the transactional email SMTP server with WP plugins for smooth functionality.
- Responsive easy to use email templates: For newcomers who are unknown to things like how to draft an email, Brevo offers you a chance to pick from in-built responsive easy-to-use email templates.
- Multi-channel workflow: All messages under one head! If you choose Brevo, you get a fantastic option to connect it to multiple social media channels to enhance the workflow.
- Instant deliverability rates: With Brevo, you can 100% be assured that your bulk emails are sent to the recipient on time without even a single second delay.
Pricing Scheme
- $7 for one month
4. Mailjet – Free SMTP Server for High Email Deliverability
A Sweden-based email marketing platform, MailJet, founded in 2010, is a cloud-based email delivery and tracking SMTP server which allows users to send marketing and transactional emails. Do you know?
MailJet routes about billions of emails to the inboxes per month. Just imagine its calibre with this only! Its free SMTP servers integrate easily with any system. Which businessman never wants his messages or emails to land on the client’s inbox faster? MailJet is the real jet that instantly delivers the email to the receiver.
To give authenticity to your emails, there is a feature known as DKIM that puts in your signature to mark your email.
Top Features
- Improve your inbox placement: MailJet assures you one thing, and that is it will definitely land your email in your recipient’s inbox. Make sure your emails do not contain spammy words.
- Monitor email performance: There is a real-time dashboard that MailJet offers you to monitor your email performance and even track the status like number of opens, bounces and unsubscribes.
- Personalize your emails: Look! It all depends upon if you’re creative or not! You can easily build your own email content and make it attractive to help you get clients as soon as they open it.
- Scalable infrastructure: Auto-scaling mechanism, 99.90% uptime and robust server protection helps your email to reach instantly and safely from online hackers.
- Configure your SMTP server (Full Control): It is your server, you have complete access over it. You can make changes to your SMTP server as per your likeness.
Pricing Scheme
- $17 for one month
5. MailTrap – Free SMTP Servers for Email Testing
Why MailTrap? How is it useful to businessmen, IT professionals extending customer support to the clients and marketing managers? Look, MailTrap email service provides you tools that can help you check if your IP is blacklisted or not, your email content is spam free or not and also use tools to test SMTP servers.
If we talk about email delivery, MailTrap is the best, as it offers instant bulk email delivery in real-time. You can even reach your recipient’s inbox in a matter of seconds. There’s a feature MailTrap offers, and that is Code snippets. You know what it is?
It is used by developers for easy integrations. Next, MailTrap also offers a SpamChecker tool that helps you to check spam material in your email content to let you resolve it quickly before you send it to your clients.
Top Features
- 99.9% your server is Up: You might’ve observed in Visa offices that due to heavy load the server crashes. MailTrap never lets that happen! Your email SMTP server offers 99.9% uptime.
- DKIM email authentication: Your email carries your identity, your signature! It’s like a key that authenticates your emails, makes them genuine and doesn’t show spam.
- 30 days email log: This feature helps you track the history of your emails sent up to 30 days. You can check status, email preview and check spam score as well.
- Actionable email analytics: Easy to look and understand dashboard and drill-down reports help you to take email related analytics. It further assists you to decide your future course of actions.
- Spam checker for Free of cost: By this feature you can assure that your IP isn’t blacklisted! You can even test that your email content is pam-free or not using this tool.
Pricing Scheme
- $15 for one mont
6. PostMark – Free SMTP Servers for Fast and Reliable
Before we talk about PostMark, let’s make it interesting for you! Do you know you can track messages, identify similar messages, simply using metadata.
Now, if we talk about PostMark, it is perhaps one of the most useful free SMTP servers for developers as it covers advanced features like tags and custom metadata. From email in-built templates to instant email delivery, PostMark is the best provider.
In a matter of minutes, PostMark sends your bulk emails to your clients located all across the globe and also makes sure that your email lands in the client’s mail box. It also gives you a fantastic portal using which you can track down your emails.
Top Features
- Blacklist IPs that land on spam: Are you not receiving any reply from your client? If so, then it can be that your message lands in a spam column. You get an amazing opportunity to blacklist those IPs right away.
- Nice DashBoard: Look, a dashboard is a place where you can track all your activities! So, PostMark offers a fantastic portal to help you know what;s the status of the emails sent.
- Bulk emailing & instant delivery: If you’re having an e-firm and you’re planning for an email campaign, then PostMark is the best option as it offers bulk emailing totally at zero cost.
- Pre-built templates and layouts: For those guys who aren’t that creative and cannot think of anything for email content, those guys can pick one from pre-designed templates.
- Fantastic integrations: How is integration helpful? See, you get notification even when you’re out not using PC, you can easily get red alerts and notification on receiving, opening and bouncing rates.
Pricing Scheme
- $15 for one month
7. SendGrid – Free SMTP Servers for Scalable Email Sending
This is the best free SMTP server for email marketing campaigns as you can send upto 148+ billion emails every month on paid plans & 100 emails per day on free plans. As far as the security of your emails are concerned, SendGrid offers SSL layer certificates via TLS encryption protecting your mails from unauthorized modifications.
Powerful infrastructure of SendGrid allows easy functions like creating and delivering bulk emails to your clients. You can even integrate SendGrid SMTP servers to CRM and CMS like wordpress as SMTP plugin to receive instant notification on sent, delivery and open actions done by the receiver.
Business prospers only when you carry out real-time analytics. SendGrid allows you to make solid decisions with perfect analytics.
Top Features
- Easy Template Editing: SendGrid lets you design and edit email templates easily with a simple drag-and-drop editor. So you just set the structure, save and then send!
- Secure and Encrypted messages: Look, your emails are safe! It ensures encryption and security, so your messages stay private and safe from hackers.
- Quick Email Delivery: Absolutely zero delays and no unnecessary waiting! SendGrid’s powerful SMTP servers deliver your emails instantly, ensuring they reach your client’s inboxes in seconds.
- 100 emails per day for Free: You can start for free as you sign in! Send up to 100 emails daily without paying a single dollar, which makes it perfect for beginners testing email marketing.
- Actionable Real-time Analytics: You can track your emails! See who opens, clicks or ignores your emails with real-time reports, so you can improve your strategy instantly.
Pricing Scheme
- $19 for one month
8. MailGun – Free SMTP Servers for Developers
Now, let’s talk about Mailgun, a free reliable SMTP service provider that helps marketers send transactional emails without the hassle of managing their own email servers.
There’s one more thing! It offers a cloud-based solution that ensures high deliverability, secure email streams and easy integration with various email clients. Let’s say you’re having a startup marketing agency sending a few emails or a large business handling millions, Mailgun scales really high to meet your needs.
Now, with built-in authentication protocols, advanced analytics and real-time tracking, it helps improve email performance while keeping spam complaints absolutely low.
Top Features
- Advanced Deliverability Tools: Mailgun ensures your emails land in inboxes and not in spam folders. With DKIM authentication, it boosts sender reputation and prevents spoofing.
- Real-Time Email Tracking: You can keep an eye on every email with Mailgun’s tracking and reporting. You can monitor open rates, click rates, bounces and delivery status with detailed comments.
- Email Validation Services: Upgrade your email list quality by checking addresses before sending. It further reduces bounce rates and prevents your domain from getting flagged.
- Scalable SMTP Infrastructure: Want to send thousands or billions of emails? Mailgun’s cloud-based SMTP server handles high volumes perfectly while maintaining speed.
- Inbound Email Routing: Easily process incoming emails with the nice routing feature. It turns complex data into readable formats, making email management smoother.
Pricing Scheme
- $15 for one month
9. SMTP2Go – Free SMTP Servers for Reliable Outbound Email Delivery
Are you really getting mad due to delayed email delivery? SMTP2Go is your one-stop solution for trustworthy, no-fuss email sending.
If you need to send transactional, marketing or personal emails, SMTP2GO ensures zero crash chances, instant email tracking and high deliverability rate! All possible without getting you tech stress!
Their free plan lets you test the sending email feature with no time limit, and their best support team is always ready to help. It takes care of the technical complexities so that you can focus on your business without worrying about email infrastructure.
Top Features
- Rock-Solid Uptime: Multi-data center infrastructure means your emails get delivered even during internet outage. Bid Farewell to irritating crashes!
- Email Tracking & Reports: Get in-depth reports into every email sent! See bounce rates, complaints, number of unsubscribes and more, just like tracking an Amazon parcel.
- No Throttling Issues: Unlike ISPs with strict limits, SMTP2Go lets you send emails without arbitrary restrictions. Heighten your email campaigns freely!
- Spam & Blacklist Protection: With built-in DKIM settings, you keep your emails out of spam folders and off blacklists easily.
- Easy Setup, Any Email Type: It works with apps, Outlook and marketing tools. Let’s say your transactional or promotional, sending emails is smooth and hassle-free!
Pricing Scheme
- $15 for one month
10. iDealSMTP – Free SMTP Server For Smart Businesses
Alright, now as we’re about to end our discussion, here we’ll like to present to you the 10th best free SMTP server provider, iDealSMTP that happens to be a hassle-free email solution.
Are you having an e-store? If you’re having one, then you should know how crucial it is to send emails that actually land in inboxes. With iDealSMTP, you’re getting more than just a basic email-sending service. They offer a secure, high-delivery SMTP relay that makes sure your promotional emails reach the right people at the right time.
And guess what? You don’t even need to be a tech genius to set it up.
Top Features
- DKIM Authentication: DKIM authorizations are like VIP passes for your emails. They ensure your messages actually land in inboxes instead of getting lost in spam folders.
- Super High Delivery Rates: Absolutely no more worrying about emails not reaching your audience. Their servers are highly optimized to get the best inbox placement.
- Dedicated IP Address: Unlike shared IPs that can get blocked due to other users, they provide a dedicated IP just for you. This means better email deliverability.
- Spam Complaint & Bounce Management: iDeal also handles the messy stuff like spam complaints and email bounces, so you don’t have to worry about email hygiene.
- 24/7 Expert Support: Are you stuck with something? Their support team is always ready to help, no matter whatever the time zone is!
Pricing Scheme
- $50 for one month
Benefit of Choosing Best Free SMTP servers in 2025
If you’re a new user and have no idea about the benefits of free SMTP servers, then you’re not alone. A lot of people have misunderstandings about the uses of SMTP servers.
You must have definitely received OTP information, confirmation emails, marketing messages from famous companies once in your work life. So, have you ever wondered how are they able to send these messages so instantly?
It’s all because of free SMTP servers.
What we’re gonna do here is, tell you the number of benefits you can get from choosing the best free SMTP server in 2025:
- Especially if you’re in the marketing sector, you should know the importance of sending promotional emails to your leads for instant conversions. So, an SMTP server helps you send the e-messages quickly without any delay at all.
- Have you ever contacted Tech support via email or ticket? Absolutely, Customer support executives who work in large firms contact their clients via email in real time. Apart from that, the client can even connect with the executive.
- If you are a software engineer or a developer, you can use free SMTP servers for testing, where it offers a proper evaluation showing open rates, bounce rates and even click tracking.
- You know it well how much security is essential when it comes to data communication. Military establishments can also use SMTP to securely connect to other departments as SMTP servers provide tight security due to TLS and SSL encryption.
And the list goes on and on! However, as far as the significant benefits of SMTP servers are concerned, we’ve told them above.
How Does SMTP Server Work?
The technical functionality of any machine seems confusing when a school student or an unaware person reads about it.
That’s why we’ve tried to decode every step word-to-word below to explain how an SMTP server works.
Before we start off with the steps, we want you to have a look at this pic below ⬇️
Let’s say John runs an e-store. He uses Gmail to send promotional emails to his leads.
- First, John types a message
- Then he enters his client’s email address and pushes the Send button
- His Gmail id then connects to Gmail SMTP server
- The SMTP server then checks email id and password for verification if it is really John or not
- Then the server checks receiver’s address, subject and message content
- Now, John’s Gmail SMTP server finds and hands over the email to the recipient SMTP server.
- Then the client’s SMTP server stores the email in his mailbox
- Let’s say John’s client uses IMAP, then in that case, he can access the message from multiple devices.
You can see that the SMTP server acts like a postman as explained in the starting of the blog.
FAQ’s
Are Free SMTP Servers Reliable for Bulk Emailing?
Yes, marketing managers, e-store owners can use free SMTP servers for bulk emailing. But there’s a small issue! The free service only allows a limited number of messages only. If you need to send thousands of emails, you’ll need a paid SMTP service.
Which Free SMTP Server is Best for Transactional Emails?
SMTP2Go and MailGun are best for transactional emails as per our reports. They are easy to set up, user friendly and reliable to send emails like for password change, order confirmation and transaction notifications.
What Are the Sending Limits of Free SMTP Services?
Different SMTP servers have different message sending limits. Free service of SMTP2Go sends upto 500 emails per day. MailGun sends around 5000+ emails per day as per their free plan.
How Do I Set Up a Free SMTP Server for My Website?
Very Simple! Sign up for a free SMTP service like Mailgun, get SMTP details like its server, port, username, password and all, enter these details into your website’s email settings, test it by sending a test email and your job is done.
What Security Features Should a Free SMTP Server Have?
A good free SMTP server must have TLS and SSL encryption to protect the mails from online threats. Should also offer IP Whitelisting feature to help you whitelist the website from where you likely want to receive emails.
Can I Use a Free SMTP Server for Marketing Emails?
Yes, of course. You can use a free SMTP server for marketing emails. You can send bulk emails instantly and also not compromise on data security. If you’re confused which SMTP you should choose for marketing, go for MailSend. It offers complete security and fast delivery of emails.
What Are the Best Free SMTP Servers for WordPress? (write 3 and why you are recommending for one of the best free SMTP Server)
For WordPress, you can go with MailSend for more data security and faster delivery, SMTP2Go for bulk email sending (upto 500 emails per day) and SendGrid for transactional emails.
How Can I Avoid Spam Filters When Using a Free SMTP Server?
If you want to make sure your emails don’t go to spam, then use a verified email address and don’t use spammy words like Win Now, Gamble, Terrorists and all.
Conclusion
SMTP server is just like your postman! He takes the message from you and without any mistake delivers the post to the rightful man. Likewise, an SMTP server locates and transfers your email to the receiver’s inbox, even stores it to protect it from unauthorized access.
This blog is a book to marketing managers, e-store owners and large firms who seek for bulk emailing, full email security, quick email delivery and instant transactional emailing too.
You can even find the catalogue of the best free SMTP servers, their unique features and premium plans to help you get a proper idea about it.
At the end, we’ll advise you to choose the free SMTP servers wisely as per the requirements of your firm.
