Free SMTP Server List: Top 10 Most Popular SMTP Services in 2025

By Sruthy

By Sruthy

Sruthy, with her 10+ years of experience, is a dynamic professional who seamlessly blends her creative soul with technical prowess. With a Technical Degree in Graphics Design and Communications and a Bachelor’s Degree in Electronics and Communication, she brings a unique combination of artistic flair…

Learn about our editorial policies.
Updated January 18, 2025
Edited by Kamila

Edited by Kamila

Kamila is an AI-based technical expert, author, and trainer with a Master’s degree in CRM. She has over 15 years of work experience in several top-notch IT companies. She has published more than 500 articles on various Software Testing Related Topics, Programming Languages, AI Concepts,…

Learn about our editorial policies.

We publish unbiased product and service reviews; our opinions are our own and are not influenced by our advertising partners. Learn more about how we review products and read our advertiser disclosures.

List of the best free SMTP Servers and SMTP Services:

SMTP service is a system of rules which is used to send email messages between the servers.

Whereas SMTP relay service is a third-party application or service which is used to transfer the email messages between different hosting services, servers, and domains.

SMTP Servers are the machines which are implemented for email delivery. Generally, servers have a limit on the number of emails to be sent per day. Hence for sending emails in bulk, you should go for a professional SMTP server.

Most Popular SMTP Email Services

SMTP services

What is SMTP Authentication?

SMTP authentication is the process in which ISP clients identify themselves to the mail server from which they are going to send an email.

SMTP server is used for sending emails. Google provides the free SMTP server through Gmail service. Anyone can send emails using Gmail and it is for free. This service can be used for sending personal emails or can be used even with your website. You can use this service for sending newsletters, contact forms, and notifications.

SMTP test tools: SMTP test tools or SMTP diagnostics tools are useful to identify and troubleshoot SMTP server problems. For this, it sends a message to the SMTP server. All these trials are displayed or recorded in a log.

=> Contact us to suggest a listing here.

Free SMTP Server List and Best SMTP Services

Enlisted below are the most popular free SMTP servers and services that are available in the market.

Comparing the Top SMTP Services

SMTP ServicesUsed ForPriceUsersSupported languages, frameworks, and libraries
Brevo

Brevo
SMTP, email marketing, SMS, and marketing automation.Free plan.Price starts at $25 for sending 40000 emails per month.BusinessesCompatible with many tools like WordPress, Drupal, WooCommerce, Google Analytics, & Salesforce etc.
SMTP

Smtp
Sending transactional emails and email marketingThe price starts at $25 for 50000 mails per monthBusinessEasy to use and powerful API for easy integration
Constant Contact

Constant Contact
Contact List Management, Marketing Automation, Email marketing. Core plan starts at $9.99/month, Plus Plan starts at $45/month. Businesses, Freelancers, Digital Marketing agencies. Connect with tools like Salesforce, Eventbrite, WordPress, Gmail, etc.
SendGrid

SendGrid_Logo
Email Newsletter, Shipping Notifications, Promotional Emails, & Password ResetsFree plan, Essentials: Starts at $9.95/month, Pro: Starts at $79.95 per month, Premier: Custom.Developers & Marketers.Frameworks and client libraries. PHP, Python, Ruby, Java, Node.js, Go, C#.
Amazon SES

Amazon_Logo
Marketing, Notification. & Transactional emailsPrice starts at $0.10.Businesses & DevelopersIntegration with other AWS services.
Mandrill

Mandrill_Logo
Data-driven emails,E-commerce,Personalized one-to-one messages. 1-20 blocks: $20 per block. 21-40 blocks: $18 per block.…Mailchimp usersPHP, Ruby, Python.
SparkPost

SparkPost_Logo
Used for better email deliverability.Free: 15000 emails The plan starts at $9 for 50000 emails.Developers.It can be used with big and small applications. It will help you in embedding the email with your app, website, or product.

Let’s Explore!!

#1) Brevo

Brevo is the best SMTP email service provider on the market.

Sendinblue SMTP Statistics

Brevo provides a platform for SMTP, email marketing, SMS, and marketing automation. With SMTP, it helps in optimizing transactional emails and ensures on-time delivery.

Features:

  • For campaigns, it provides real-time statistics.
  • Dedicated IP addresses.
  • It provides a performance dashboard.
  • It will give you a record for each email sent.
  • While integrating with Brevo SMTP, it allows you to select API, Classic SMTP parameters, Postfix Configuration, and Brevo PHP library.

Price: Based on the number of emails, there are five plans.

Plan Number of emailsPrice per month
Free Plan300/dayFree.
Lite40000/month$25
Essential60000/month$39
Premium120000/month$66
EnterpriseCustom

#2) SMTP

Best for Scalable Infrastructure and Quick Set-up.

smtp

While SMTP may not offer its servers for free, you do get a highly responsive and scalable infrastructure that can be used to send a billion or more emails a month at a rapid pace. You’ll notice no latency and are guaranteed to enjoy top-notch deliverability rates.

Features:

  • Email Relay API
  • Shared and Dedicated IP
  • Expert Support
  • Detailed Reporting

Price: You get four subscription plans to choose from. The essential plan costs $25 for 50000 mails per month. The starter plan costs $80 for 100,000 mails per month. The Growth plan costs $300 for 500000 mails per month. The Business plan costs $500 for 1,000,000 emails per month.


#3) Constant Contact

Best for Email Marketing Automation and Contact List Management.

Constant Contact

Constant Contact is arguably one of the most popular and widely used SMTP Servers around today. It comes jam-packed with a plethora of features that aim to transform your email marketing experience. The platform offers tons of pre-designed templates along with a drag-and-drop builder to help you create emails any way you like.

You also have the privilege of managing your entire email contact list with this platform. Constant Contact automatically segments the contact list on your behalf, thus making it easier for you to send relevant emails to the right recipient. Its real-time analytical abilities also make it exceptional when it comes to SMTP servers.

Features:

  • Drag and Drop Email Builder
  • Easy List Management
  • Contact list segmentation
  • Hundreds of pre-designed email templates
  • Real-time Insight and analytical reporting

Price:

PlanNumber of UsersPrice
Core5Starting at $9.99/month
PlusUnlimitedStarting at $45/month.

#4) Mailjet

Best For: It is good for SMTP service.

Mailjet

Mailjet is an email service for creating, managing, sending, and optimizing emails. It provides a transactional email service for marketers and developers. It provides SMTP Relay or Send API for bulk emails.

Suggested reading =>> Mailjet- A comprehensive review

Features:

  • Email designing with the team.
  • Easy to design an email because of the drag-and-drop editor.
  • In-depth analytics.
  • Real-time collaboration.

Price: There are four plans, i.e. Free, Basic, Premium, and Enterprise. To know more about the Enterprise plan, you can request a quote. Below mentioned prices are applicable if you are billed annually.

No. of emailsFreeBasicPremium
6000$0$8.69/month$18.86
60000$17.06$37.76
150000$62.06$87.26
450000$150.26$206.96
900000$300.56$359.06

Visit Website: https://www.mailjet.com/?tap_a=25852-4bddf6&tap_s=454591-2a2073&aff=454591-2a2073


#5) SendGrid

Best For: Email marketing and as a transactional email API.

SendGrid

SendGrid provides the best email delivery service.

It provides APIs, SMTP Relays, and Webhooks. It promises fast and customizable integration. Support is provided through videos, online community, and documentation. This single email platform can be shared with the team.

Recommended reading =>> Top SendGrid Competitors

Features:

  • SendGrid API and SMTP integrations will help you for transactional email requirements.
  • It provides flexible API and SMTP setup.
  • It offers dedicated IP addresses.
  • It includes many other email deliverability features like reputation monitoring and email authentication.

Price:

PlansNumber of emails/monthPrice
Free40000 for 30 days then 100/day$0
Essentials100000$9.95
Pro100000-1.5 million$79.95
PremierMore than 1.5 millionCustom

Website: https://sendgrid.com/


#6) Amazon SES

Best For: It is a great platform at a low price. It is a reliable service.

Amazon SES

Amazon SES is an email sending and receiving platform that can be used for transactional messages, marketing communications, notifications, and for incoming emails.

This SMTP interface allows integrating email sending capabilities into your current ticketing system or email clients.

Features:

  • Using SMTP interface or AWS SDKs, Amazon SES can be directly integrated into your applications.
  • It provides easy to use mailbox simulator.
  • Amazon SES can be integrated with other AWS services.
  • Dedicated IP addresses.

Price:

PlansEmailsAttachments
Email from an application on Amazon EC2First 62,000 emails are free. There onwards it will cost $0.10 for 1000 emails. For attachments sending: $0.12 for one GB.
Email client or another software package $0.10 for 1000 emails.For attachments sending: $0.12 for one GB.
Email receivingFree for 1000 emails. There onwards $0.10 for 1000 emails. For incoming email chunks: $0.09 for 1000 emails

Website: https://aws.amazon.com/ses/


#7) Mandrill

Best For: This service is made for developers. It is best for transactional emails.

Mandrill

For MailChimp users, Mandrill provides transactional email services. It is for data-driven emails like e-commerce or personalized one-to-one messages. You can send and track emails through API or SMTP integration.

Features:

  • It provides dedicated IP addresses.
  • It allows you to send from multiple domains for each account.
  • It provides in-depth analytics.

Price: Dedicated IP can be added for $29.95 per month.

EmailsBlocksPrice per block
1-500KJanuary 1, 2020$20
500K-1M21-40$18
1M-2M41-80$16
2M-3M81-120$14
3M-4M121-160$12
More than 4 MMore than 161$10

Website: https://mandrill.com/


#8) SparkPost

Best For: Best for Email Deliverability. It is a scalable Email delivery system for developers.

SparkPost

It is an email delivery service which can be used by small and big companies. It will help you from creating customer engagement email to better delivery of an email. It provides flexible pricing plans.

Features:

  • It helps in optimizing customer engagement through predictive insights.
  • Real-time email analytics.
  • It will improve email deliverability.
  • It helps you to embed emails into your app, product, or website.
  • It offers support for dedicated IP addresses and it is a paid feature.
  • It provides analysis for the deliverability of emails.

Price: There are three pricing plans, i.e. Standard, Premium, and Enterprise. To know more details about the Premium and Enterprise plan you will have to contact the company.

No. of emailsStandard Plan prices per month
15000Free
50000$9
150000$49
250000$124
500000$249
1M $474

Website: https://www.sparkpost.com/


#9) Mailgun

Best For: It provides the best SMTP service and good transactional email service.

Mailgun

Mailgun provides Email API, Email Validation, and deliverability services. It supports burst sending, and with this service, you can send up to 250000 emails per minute. It provides easy SMTP integration.

Features:

  • Advanced email analytics.
  • IP allocation management.
  • Sending transactional and bulk emails is easier with the help of SMTP integration and RESTful API.
  • It provides email validation.

Price: Price depends on the number of emails and the number of validations you require. Here only a few plans are mentioned. Prices mentioned here are based on the number of emails for 100 validations.

EmailsPrice per month
10000$0
30000$10
100000$79
More than 5000000Custom

Website: https://www.mailgun.com/


#10) Postmark

Best For: System is made for developers and is best for transactional emails.

Postmark

Postmark SMTP servers are in San Jose, Newark, and Amsterdam.

It automatically selects the nearest server for your transactional email. SMTP differs from REST API in their response codes. For REST API, you will immediately get a success or error message for the sent message. While SMTP accepts every message and logs bounces for the error.

Server: smtp.postmarkapp.com

Ports: 25, 2525, 587.

Features:

  • It tracks the messages using custom metadata.
  • It allows you to group common types of messages.
  • It provides developer-friendly SMTP documentation.

Price:

Emails/monthPriceFor 1000 extra emails
10000$10$1.25
50000$50$1
125000$100$0.85
300000$200$0.60
700000$400$0.45

Website: https://postmarkapp.com/why/smtp-service


#11) MailGet SMTP

Best For: Email marketing.

MailGet_SMTP

It is an SMTP Relay service.

MailGet SMTP will help you to send emails for marketing, alerts, receipts, invoices, registrations, and notifications. You can use this service for bulk emailing and they have their private servers.

Features:

  • Deliverability: It assures you to deliver email to the inbox.
  • They have whitelisted servers.
  • It allows you to send bulk emails and emails from multiple verified domains.
  • Authentication is provided using SPF validation and DKIM signature.

Price:

Plan NameNumber of emails/monthPrice per month
Starters5000$5
Rookie50000$29
Pro100000$49
Advance120000$59

Website: https://www.formget.com/smtp/


#12) MailGet Bolt

Best For: Email marketing.

MailGet_Bolt

It is an email service to send Marketing, Educational, Informative, and Promotional emails.

It provides many features like email scheduling, autoresponders, list management, list cleaning etc. It helps you in building emails with the drag-and-drop facility.

Features:

  • It allows you to add unlimited custom tags.
  • It provides more than 500 custom designed templates for email.
  • It supports importing of email contacts using CSV files or you can add them manually.
  • It has auto-send options for the follow-up process.
  • Series of emails can also be sent automatically.

Price:

PlansSend emails to- Number of subscribersPrice per month
Starters2500$9
Rookie5000$19
Pro10000$34
Advance15000$49

Website: https://www.formget.com/mailget-bolt/


Few SMTP test and diagnostics tools are listed here:

SMTP Test Tool
MxToolbox
Spiceworks
Wormly

Conclusion

This was all about the SMTP services, SMTP Relay, and Free SMTP server. If we compare the top two services i.e. Brevo and SendGrid for features, there is an absence of email preview and email re-send functionality in SendGrid.

Amazon provides the best email services at low prices. Amazon pricing plans are more flexible and affordable. If we compare Send Grid, Mailgun, SparkPost, and Pepipost for the price then Pepipost has more affordable plans.

Hope you will found this article helpful in knowing about SMTP services, SMTP Relay, and Free SMTP server.

=> Contact us to suggest a listing here.

Was this helpful?

Thanks for your feedback!

Leave a Comment