free public SMTP server options, the most typical choice for quite a few companies and startups in reverse to a self-hosted SMTP server.

Normally, giant companies can afford self-hosted servers. Having an SMTP server within the cloud means that you’re free of this burden. You need to use the assets you want for mailing and, therefore, save money and time. Additionally, the cloud-based providers we have now chosen are skilled. They supply what you want in your mission: 


A cloud-based server is an efficient discount. You’ll have to spend a lot extra to create and keep your individual e mail atmosphere. In addition to, the choices beneath present completely free subscription plans.


Cloud-based SMTP providers are designed to course of excessive volumes of emails. Additionally, they normally cooperate with mailbox suppliers. This ensures prime deliverability charges. 


Your e mail marketing campaign might have 1000’s and even hundreds of thousands of emails. This isn’t an issue for the cloud-based infrastructure and all of your messages will probably be despatched rapidly. Additionally, the providers can alter to your emailing wants, which saves you cash as effectively. 


It’s not solely about digital safety. If in case you have constructed your server atmosphere, you’ll have taken care to guard towards bodily injury to your {hardware}. Hopefully, you do not need to fret about this if you happen to go for a cloud-based SMTP server.

What’s the Distinction Between SMTP Server, SMTP Relay, and SMTP Service? 

  • An SMTP server is a pc program or app that sends or relays outgoing emails utilizing the Easy Mail Switch Protocol. 
  • From a technical standpoint, SMTP relay is the method of supply of emails from one mail server to a different. SMTP relays are important to ship out all types of bulk mail, transactional emails, newsletters, and so on. Within the context of e mail advertising, SMTP relay providers normally discuss with the precise SMTP servers. 
  • SMTP service is a normal notion that denotes an off-the-shelf e mail infrastructure that features one or a number of SMTP servers. 

Comparability of Free SMTP Server Suppliers

1. Gmail SMTP Server

Let’s begin with the best-known free SMTP service. Anybody who has a Gmail account can ship emails utilizing Google’s free SMTP server. So, it’s not only for private messages. You can also make use of the Gmail SMTP server for notifications, contact varieties, and anything you want in your internet app. 

This service is an ideal resolution for small companies and firms that don’t plan to ship excessive volumes of emails. The Gmail SMTP server is completely free however has some limitations, which you will discover within the documentation. At the moment, you’ll be able to ship as much as 100 emails per day.

When you’ve reached certainly one of these limits, e mail sending will probably be blocked for as much as 24 hours. To extend the bounds, you’ll be able to join a paid Google Workspace account. 

The Gmail SMTP server is a free and helpful resolution for sending emails however it’s not an choice for bulk e mail. So what’s? The next choices are appropriate for high-volume e mail campaigns. 

2. Elastic Electronic mail

Elastic Electronic mail provides an e mail advertising platform together with an e mail supply engine that may be related for sending emails by way of HTTP API or SMTP. 


  • Subscription varieties
  • Analytics
  • Electronic mail template designer
  • Electronic mail verification (paid)
  • Non-public IP addresses (paid)


You can begin utilizing Elastic Electronic mail with a free trial, which lets you ship as much as 100 emails per day. This can be sufficient on the outset of your mission. Over time, you’ll want bigger volumes of emails. For this, Elastic Electronic mail offers Pay-As-You-Go plans for sending engine: 

  • Electronic mail API – $0.10 per 1,000 emails plus $0.40 per day
  • Electronic mail API Professional – $0.12 per 1,000 emails plus $1 per day

The e-mail advertising toolkit is offered with a month-to-month plan that enables sending a vast variety of emails. As an alternative, you pay for the variety of contacts. It begins from $15/month per 5,000 contacts.


You can’t ship greater than 100 emails per day without cost. You additionally have to confirm a sender so as to ship over 500 emails per day. 

SMTP limits are:

  • As much as 20 concurrent requests from a single IP
  • A single command timeout is 2 minutes
  • A number of emails might be submitted in a single session

API connection limits embody: 

  • As much as 20 concurrent requests from single IP
  • Connection timeout is 600 seconds

3. Axigen

Axigen provides an all-in-one mail server, calendaring, and collaboration resolution that helps SMTP, IMAP, POP3, and webmail providers, and consists of options akin to an built-in mailing record server, Antivirus and Antispam integration choices, and extra.


  • Enterprise Mail Server
  • Calendaring & collaboration 
  • WebMail with desktop-like usability & cell WebMail interface
  • Native & distant entry
  • Wi-fi cell sync with ActiveSync-enabled units
  • In depth safety toolset
  • Easy administration & 24/7 assist
  • On-premise choices for SMTP


Axigen provides a free mail server you will get began with. Should you’re searching for extra customers, although, you’ll be able to select between 2 completely different, quote-based, license varieties:

  • Enterprise core: core functionalities (you too can select extra add-ons)
  • Enterprise full: an all-inclusive bundle.


Axigen is an on-prem resolution; there aren’t any limits to what number of emails you’ll be able to ship.

4. Mailjet

Mailjet is a sophisticated service for dealing with. It’s primarily for builders and entrepreneurs. Inside the matter of this text, Mailjet has a free SMTP server to supply. It’s represented as an SMTP Relay Service that you would be able to simply combine inside your app. Not like comparable options, Mailjet helps a number of SMTP ports. In follow, this provides larger flexibility for sending emails. Should you want a standard HTTP connection, Mailjet Ship API can also be out there.


  • APIs, SMTP Relay, Webhooks
  • Help for a number of SMTP ports
  • Excessive inbox placement charge
  • Actual-time dashboard for monitoring e mail efficiency
  • Superior templating language
  • Devoted IP (paid)
  • A/B testing (paid)
  • Multi-user collaboration (paid)


If you wish to do that service, you can also make use of 6,000 emails per 30 days. You’ll get them without cost with none expiration interval or having to supply any bank card particulars. If extra e mail quantity is required, you’ll have to pick out one of many subscription plans: Fundamental, Premium, or Enterprise. The Fundamental plan begins at $9.65 for 30,000 emails per 30 days, and consists of each API and e mail editor. 

SMTP limits:

The free trial subscription is restricted to sending 200 emails per day. 

5. turboSMTP 

turboSMTP is a dependable and cost-effective SMTP service. It offers a free model with 6,000 emails per 30 days, for one yr. Check out the options this SMTP server provides.


  • Actual-time monitoring of e mail campaigns
  • Electronic mail advertising supply system
  • Electronic mail template creator
  • Subuser administration (paid)
  • Devoted IP deal with (paid)


turboSMTP offers each month-to-month plans and a Pay-As-You-Go choice. The latter permits you to buy pay as you go credit and use them solely when you want to ship emails. For instance, you should purchase 100,000 emails for $92 and ship them at any time for one yr. Should you take care of recurrent e mail sending, contemplate the Fundamental or Professional plans for your small business. The most cost effective choice prices $14.95/month for 50,000 relays.


With the free plan, you’ll be able to ship as much as 200 emails per day. 

6. Mailgun 

Mailgun is marketed as an e mail service for builders. Nonetheless, it has varied options for individuals who want SMTP to ship transactional emails and advertising campaigns. The best approach to get began with sending emails is to make use of the SMTP relay service. For this, you want to:

  • Add and confirm your area title
  • Select between a devoted or shared IP deal with
  • Arrange your SMTP server

The SMTP configuration of your app needs to be tweaked together with your username, password, hostname, and port of the SMTP server. An alternative choice is the SMTP API, which considerably improves e mail dealing with. 


  • Electronic mail API, SMTP Relay, and Webhooks
  • Electronic mail monitoring and Analytics
  • Suppression administration
  • Devoted IP (paid)
  • Electronic mail deal with validation (paid)
  • Inbox placement checks (paid)


As for pricing, you get 5,000 free emails per 30 days for 3 months. Once you want extra, you’ll be able to both use the Pay-As-You-Go choice or buy a subscription plan. Pay-As-You-Go helps you to purchase additional emails beginning at $0.80 per 100 emails. Month-to-month subscriptions begin at $35 with 50,000 emails. 

SMTP limits:

Regardless of permitting 10,000 free emails per 30 days, all new domains are included within the sandbox. This limits the e-mail sending to 300 emails per day and you’ll solely ship to five approved recipients. 

Should you submit your bank card data, you’re upgraded to the Flex plan. It’s basically the Free plan, however with no restrict on the variety of emails despatched or acquired.

7. Sendinblue

Sendinblue is a bulk e mail service. It offers completely different instruments for optimizing advertising workflow. One in every of them is the SMTP relay. This can be a skilled server to ship transactional emails despatched out of your internet app. In addition to SMTP server, you’ll be able to go for API and ecommerce plugins to arrange your bulk e mail sending.


  • Actual-time reporting 
  • Superior templating language primarily based on Django
  • Touchdown web page builder
  • APIs, webhooks
  • Multi-user entry (paid choice)
  • Warmth map reporting (paid choice)
  • Devoted IP deal with (paid choice)


The free plan is limitless by way of use, however you’ll be able to solely ship as much as 300 emails per day. That is 3 times greater than the Gmail SMTP server, however it nonetheless might not be sufficient for large-scale bulk e mail. There isn’t any Pay-As-You-Go choice with Sendinblue, and you must choose one of many out there subscription plans: 

  • Lite – 10,000 emails for $25/month
  • Premium – 20,000 emails for $65/month

There’s additionally an enterprise resolution for entrepreneurs who ship greater volumes of emails. 

SMTP limits:

Your each day restrict is 300 emails. Additionally, for shared IPs, there’s a quota of 40 emails per hour. This bandwidth restrict goes up or down mechanically primarily based in your engagement metrics and sending quantity. 

8. SendPulse

SendPulse is one other of the majority e mail providers on our record. It offers the SMTP server for every type of emails. You may combine it together with your app or different system and ship transactional emails rapidly, securely, and without cost. SendPulse provides 12,000 emails per 30 days at no cost! 


  • Excessive deliverability because of good sender status
  • APIs 
  • Electronic mail template creator
  • DKIM and SPF authentication
  • Supply experiences
  • Unsubscribe monitoring
  • Devoted IP (paid)


As we mentioned, you get 12,000 free transactional emails per 30 days. In order for you extra, you’ll be able to both pay for added emails (for instance, 10,000 for $15) or buy a subscription plan: Fundamental, Professional, or Enterprise. The worth for every plan differs in accordance with the e-mail quantity you want. For instance, Fundamental with 25,000 emails will value $8.85/month.

SMTP limits:

The free plan permits you to ship as much as 50 emails per hour utilizing 2 sender domains. This worth goes up considerably if you happen to use a subscription plan or purchase extra emails with the Pay-As-You-Go choice. For instance, with the Fundamental plan (25,000 emails), your bandwidth restrict is 2,500 emails per hour. Should you purchase 25,000 emails with Pay-As-You-Go, the restrict will probably be 4,000 emails per hour.  

Be aware, nonetheless, that e mail measurement issues for Pay-As-You-Go emails – emails greater than 100 Kb are counted as a number of emails. 

9. SendGrid

SendGrid is a famend e mail supply service and a cloud-based SMTP supplier. It provides SMTP Relay, Internet APIs, and Webhooks for sending transactional and bulk emails.


  • Repute monitoring
  • Electronic mail authentication
  • Supply optimization instruments
  • Electronic mail API
  • Actual-time analytics
  • Occasion webhook
  • Transactional templates
  • Devoted IP deal with (paid)
  • Subuser administration (paid)


SendGrid’s free plan offers 100 emails per day eternally. In case your e mail volumes are huge, try one of many paid subscription plans: Necessities, Professional, and Premier. The costs differ principally relying on the options you get reasonably than the variety of emails. For instance, 15,000 emails per 30 days with Necessities prices $14.95, and with Professional it prices $89.95. By the best way, the costs are estimated, so taxes and overages might apply.

SMTP limits:

An e mail to be despatched to a number of recipients has a tough restrict of 10,000 addresses. It’s advisable to separate up giant jobs into chunks of round 1,000 recipients. This improves load distribution. 

10. Amazon SES

Amazon SES (Easy Electronic mail Service) is a cloud-based platform for companies that makes use of e mail to speak with their customers. It offers a number of email-sending interfaces: 

  • Console
  • SMTP interface 
  • API by way of AWS SDK or AWS CLI

You need to use the SMTP interface to combine Amazon SES into your app, e mail consumer, ticketing system, or different software program. 


  • A number of strategies to watch email-sending exercise
  • Sender status dashboard
  • Versatile e mail receiving
  • Mailbox simulator to check e mail sending
  • Help for industry-standard authentication mechanisms: SPF, DKIM, and DMARC
  • Personalization of emails
  • Excessive deliverability
  • Devoted IP deal with for unique use (paid)


The pricing system consists of no upfront prices or subscriptions. Customers pay $0.10 for each 1,000 emails despatched or acquired. Knowledge within the emails is paid as well as: $0.12 per gigabyte. We promised a listing of free SMTP providers, proper? Amazon SES offers a free utilization tier for the primary 62,000 emails despatched every month, however these emails have to be despatched from an app hosted on Amazon EC2. The primary 1,000 emails acquired are additionally free. 

SMTP limits:

All new accounts are positioned within the Amazon SES sandbox, which suggests there are sending limitations. In response to these, you’ll be able to ship as much as 200 emails at a charge of 1 e mail per second per 24 hours. You may improve your sending limits by shifting out of the sandbox.

11. Netcore Electronic mail API (previously often known as Pepipost)

Netcore Electronic mail API (you might need heard of it as Pepipost) provides a beneficiant eternally free plan. To check all of the capabilities of the device, you get 30,000 emails for the primary month, and after that may have the ability to ship 100 emails per day without cost. 


Netcore e mail API is an e mail supply service that you would be able to combine together with your email-sending device or app as an SMTP server, or entry its performance by way of API and ship bulk and transactional emails out of your area. 

It’s extra appropriate for builders reasonably than entrepreneurs as a result of Netcore Electronic mail API doesn’t supply an e mail builder or templates. Its job is to ship your emails and report on these outcomes: 

  • Deliverability as a precedence —  they use Machine Studying and Synthetic Intelligence algorithms to optimise sending processes
  • Safety because of dependable infrastructure, authentication strategies, and compliance with rules. 
  • Webhooks and bounce forwarding for monitoring despatched emails


The worth relies upon solely on the variety of emails you ship —  all options are included in each plan. Every little thing between 30,001 and 150,000 emails prices $25 per 30 days and $0.60 for 1,000 emails if you happen to want additional. The subsequent plan consists of 400,000 emails for $85 and $0.55 for 1,000 additional emails. 1,000,000 emails will value you $445 per 30 days. 

SMTP limits:

On the free plan, you might be restricted to 100 emails per day. After upgrading, this restrict will increase to 1,000 emails per day. This restrict might be elevated mechanically primarily based on the emails’ efficiency. It will depend on the amount of emails you ship, their high quality, recipients’ engagement, and so on.

Which Service Permits you to Ship 10,000 Emails at As soon as for Free?

Let’s be lifelike — not one of the providers will allow you to ship 10,000 emails without delay without cost. In addition to, such a quantity of emails despatched from a single e mail deal with in a single go will certainly set off spam filters. So, one of the best ways is to separate the e-mail marketing campaign into 5 batches of two,000 emails every.

Out of all of the providers talked about above, solely 5 assist you to ship such a quantity of emails without cost. These are Amazon SES, Mailgun, SendGrid, SendPulse, and Netcore Electronic mail API. However all of them have each day sending quotas or different limitations. SendPulse may very well be an choice, however with its restrict of fifty emails per hour, it is going to take 200 hours for the complete marketing campaign!

When and Why Must you Go for a Pretend SMTP Server As an alternative of a Actual One?

An actual SMTP server is supposed to ship your emails to the recipients. Why would you want a faux one then? Dummy or faux SMTP servers are helpful for testing functions — they test the email-sending functionality of an app.

Let’s say you need to discover out whether or not your internet app capabilities effectively by way of sending emails. For this, you want to ship an e mail or a number of emails (for load testing) to actual recipients. However you do not need to spam them, do you? So, you want to take care to arrange a number of take a look at e mail addresses. It’s reasonably inconvenient to hold out all these manipulations manually. 

To Wrap Up

So, which of the free SMTP providers would we suggest? Clearly, the one that may let your small business scale seamlessly.

A free trial plan is an efficient launching pad in your mission. Should you plan to develop and prosper, you’ll should stage up. On this case, have in mind what every of the aforementioned providers can present from the long-term perspective. This fashion, you may work out whether or not it’s a good match or not. Take care and good luck in your endeavours!

I hope you loved studying our information, which was initially revealed on the Mailtrap weblog by Zakhar Yung.

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