Best 8 SMTP Relay Service Providers for Reliable Email Delivery in 2025

Email is still one of the most powerful tools for communication and marketing in 2025. Whether you're sending newsletters, transactional emails, or bulk campaigns, reliable delivery is key. This is where SMTP relay service providers come in. These services help route your emails through trusted servers to make sure they land in your recipients’ inboxes instead of spam folders.

In this blog, we’ll explore the 8 best SMTP relay service providers for reliable email delivery in 2025. Each one is chosen based on deliverability, features, pricing, and ease of use.

Let’s begin!

1. SMTPGET (Best Overall SMTP Relay Service)

SMTPGET tops our list in 2025 due to its fast delivery, user-friendly dashboard, and excellent support. It is a favorite among businesses of all sizes, especially , for bulk emailing and transactional services.

Key Features:

• High deliverability for bulk emails

• Real-time analytics and reporting

• Easy-to-integrate SMTP settings

• Dedicated IP and domain reputation support

• 24/7 customer support

Best For: Small to medium-sized businesses, marketers, and developers.

Pricing: Affordable pricing plans with a free trial for new users.

Why Users Love It: Reliable delivery, easy setup, and prompt support team.

2. Brevo

Brevo offers a full marketing suite, and its SMTP relay service is trusted by many eCommerce and SaaS companies.

Key Features:

• Easy SMTP setup

• Real-time tracking

• Dedicated IP for high volume senders

• GDPR-compliant

Best For: Online stores and SaaS platforms.

3. Mailgun

Mailgun is a powerful SMTP relay provider used by developers and tech-savvy marketers. It offers flexible APIs for custom email solutions.

Key Features:

• Email APIs and SMTP relay

• Email validation tools

• Webhooks and analytics

• Scalable for high volume

Best For: Developers, startups, and enterprises.

4. SendGrid

SendGrid is known for high deliverability and scalable infrastructure. It's widely used by large companies and startups alike.

Key Features:

• Cloud-based SMTP service

• Powerful APIs

• Email templates and A/B testing

• Deliverability insights

Best For: Large-scale businesses and developers.

5. Amazon SES

Amazon SES is a budget-friendly SMTP relay service from Amazon Web Services. It’s highly reliable and trusted globally.

Key Features:

• SMTP and API support

• Scalable email sending

• Bounce and complaint tracking

• Deep AWS integration

Best For: Developers, tech businesses, and AWS users.

6. Elastic Email

Elastic Email is an affordable and scalable SMTP relay services, perfect for those with limited budgets but high email volume needs.

Key Features:

• Full SMTP support

• Email scheduling

• Drag-and-drop email builder

• Advanced analytics

Best For: Small businesses and email marketers.

7. Postmark

Postmark focuses on transactional emails and delivers them quickly and reliably.

Key Features:

• Ultra-fast delivery for transactional emails

• SMTP and API support

• Bounce management

• Detailed email logs

Best For: SaaS tools and developers.

8. Moosend

Moosend is a marketing automation platform with SMTP capabilities. It’s great for those who want both marketing tools and email delivery.

Key Features:

• SMTP relay

• Email automation

• Campaign analytics

• List segmentation

Best For: Marketers and eCommerce businesses.

Final Thoughts

Choosing a reliable SMTP relay service in 2025 can improve your email deliverability, boost open rates, and maintain your sender reputation. If you want a service that balances cost, performance, and ease of use, SMTPGET is the best choice.

Each provider listed above has its own strengths. Whether you’re a developer, marketer, or small business owner, there’s an SMTP solution here for you.