16 Free SMTP Server Options Without Authentication

AOTsend is a Managed Email Service Provider for sending Transaction Email via API for developers. 99% Delivery, 98% Inbox rate. $0.28 per 1000 emails. Start for free. Pay as you go. Check Top 10 Advantages of Managed Email API

When it comes to sending emails, having a reliable SMTP (Simple Mail Transfer Protocol) server is crucial. However, not everyone needs or wants to set up complex authentication processes. Fortunately, there are free SMTP server options available that don't require authentication. In this article, we'll explore 16 such options, making it easy for you to send emails without any hassle.

1. Mailgun

Mailgun offers a powerful API for sending, receiving, and tracking emails. Their free plan allows you to send up to 10,000 emails per month without any authentication requirements.

2. SendGrid

SendGrid provides a cloud-based email infrastructure service. Their free tier enables you to send up to 40,000 emails for the first 30 days without authentication, making it an excellent choice for those who need a quick and easy solution.

3. SparkPost

SparkPost offers a generous free tier that lets you send up to 15,000 emails per month without any authentication. It's an ideal option for developers who want to integrate email functionality into their applications.

4. Mailjet

Mailjet provides a user-friendly email marketing and transactional email service. Their free plan allows you to send up to 6,000 emails per month without the need for authentication, making it suitable for small businesses and startups.

5. SendinBlue

SendinBlue is an all-in-one marketing platform that includes email marketing and SMTP relay services. Their free plan permits up to 300 emails per day without authentication, perfect for those just starting with email marketing.

6. Elastic Email

Elastic Email offers a scalable email delivery platform. Their free tier enables you to send up to 2,500 emails per day without any authentication, suitable for individuals or small businesses.

7. Mandrill

Although Mandrill is now part of Mailchimp, it still offers a standalone SMTP service. Their free plan allows you to send a limited number of emails per month without authentication, ideal for those who need a simple and straightforward solution.

8. Postmark

Postmark specializes in transactional email delivery. Their free tier lets you send up to 100 emails per month without authentication, perfect for developers who need a reliable SMTP service for their apps.

【AOTsend Email API】：
AOTsend is a Transactional Email Service API Provider specializing in Managed Email Service. 99% Delivery, 98% Inbox Rate. $0.28 per 1000 Emails.
AOT means Always On Time for email delivery.

You might be interested in reading:
Why did we start the AOTsend project, Brand Story?
What is a Managed Email API, Any Special?
Best 25+ Email Marketing Platforms (Authority,Keywords&Traffic Comparison)
Best 24+ Email Marketing Service (Price, Pros&Cons Comparison)
Email APIs vs SMTP: How they Works, Any Difference?

9-16. Other Options

In addition to the above options, there are several other free SMTP servers without authentication available, such as SMTP2GO, Amazon SES, MailerSend, Moosend, SendPulse, Pepipost, MailUp, and EmailOctopus. These services offer various free tiers with different email sending limits, providing flexibility for different needs.

In conclusion, there are numerous free SMTP server options available without authentication, catering to a wide range of email sending requirements. Whether you're a developer, a small business owner, or an individual, you can find a suitable solution among these options. Try out these services and see which one works best for your needs.

AOTsend adopts the decoupled architecture on email service design. Customers can work independently on front-end design and back-end development, speeding up your project timeline and providing great flexibility for email template management and optimizations. Check Top 10 Advantages of Managed Email API. 99% Delivery, 98% Inbox rate. $0.28 per 1000 emails. Start for free. Pay as you go.