Below are the most widely used affordable SMTP services for sending bulk emails.

1. Amazon SES – Cheapest SMTP for High-Volume Email

Amazon SES (Simple Email Service) is widely considered the most cost-effective SMTP provider available today.

Key Features

• Pay-as-you-go pricing
• High scalability
• AWS infrastructure reliability
• SMTP and API integration
• Advanced email authentication

Pricing

Amazon SES costs around $0.10 per 1,000 emails, which means sending 100,000 emails may cost only $10–$15 per month.

Pros

• Extremely cheap for bulk emails
• Highly scalable infrastructure
• Reliable deliverability

Cons

• Technical setup can be complicated
• Requires AWS knowledge

Best For

• Developers
• SaaS companies
• Large-scale marketing campaigns

Amazon SES is often recommended by developers because of its low cost and strong infrastructure.

Reddit users frequently mention that SES is “the cheapest option for large volumes.”

2. SendGrid – Popular SMTP Service for Marketing

SendGrid is one of the most well-known email delivery platforms used by thousands of companies worldwide.

Key Features

• Email marketing tools
• Real-time analytics
• API and SMTP integration
• Dedicated IP options

SendGrid is commonly used for both transactional emails and marketing campaigns.

Pricing

Plans start around $19–$35 per month, depending on email volume.

Pros

• Easy integration
• Powerful analytics
• Good deliverability

Cons

• More expensive than Amazon SES
• Some advanced features require premium plans

Best For

• SaaS platforms
• E-commerce stores
• Marketing teams

Many major websites use SendGrid to deliver order confirmations, password resets, and marketing campaigns.

3. Mailgun – Developer-Friendly SMTP Platform

Mailgun is a powerful SMTP provider designed mainly for developers and tech companies.

It provides advanced APIs and tools to automate email sending and tracking.

Key Features

• Email validation
• Advanced analytics
• Email routing
• Powerful API integration

Mailgun is widely used by developers to build custom email workflows.

Pricing

Mailgun plans typically start around $35 per month, depending on email volume.

Pros

• Excellent documentation
• Flexible APIs
• Strong analytics tools

Cons

• Not beginner-friendly
• Limited marketing tools compared to competitors

Best For

• Software companies
• Web developers
• Application notifications

Mailgun works particularly well for transactional email systems and application notifications.

4. Brevo (formerly Sendinblue) Best All-In-One Marketing SMTP

Brevo is a marketing automation platform that includes SMTP services, email campaigns, and CRM tools.

Key Features

• Email marketing automation
• CRM integration
• SMS marketing
• Drag-and-drop email builder

Brevo offers both transactional email sending and marketing automation in one platform.

Pricing

• Free plan: 300 emails per day
• Paid plans start around $25/month.

Pros

• Beginner-friendly interface
• Free plan available
• Marketing tools included

Cons

• Dedicated IPs cost extra
• Advanced features limited on cheaper plans

Best For

• Small businesses
• Bloggers
• Marketing teams

Brevo is ideal if you want SMTP delivery and email marketing tools in one platform.

5. SMTP2GO – Reliable Budget SMTP Server

SMTP2GO is known for its reliable email delivery and strong reputation management tools.

Key Features

• 99.99% uptime
• Real-time analytics
• Dedicated IP support
• API and SMTP integration

SMTP2GO focuses on providing simple and reliable email delivery infrastructure.

Pricing

Plans start around $10 per month for 10,000 emails.

Pros

• Very reliable delivery
• Easy setup
• Strong technical support

Cons

• Limited marketing features
• Higher plans required for large volumes

Best For

• Small businesses
• Agencies
• WordPress websites

Independent testing has shown SMTP2GO with high deliverability rates compared to other SMTP relays.

How to Choose the Best Cheap SMTP Server

When selecting an SMTP service, several factors should be considered.

1. Deliverability Rate

The most important factor is whether your emails reach inboxes instead of spam folders.

2. Pricing Model

Some providers offer pay-as-you-go pricing, while others charge monthly subscriptions.

3. Ease of Use

If you are not a developer, choose a platform with simple dashboards and integrations.

4. Integration Options

Ensure the SMTP provider supports integration with your website or CRM.

5. Scalability

Your provider should support future growth in email volume.

Tips to Improve Bulk Email Deliverability

Even with the best SMTP provider, poor email practices can cause emails to land in spam folders.

Here are some tips to improve deliverability:

Use Email Authentication

Configure:

• SPF
• DKIM
• DMARC

These authentication methods verify that your emails are legitimate.

Warm Up Your Domain

Start with small email volumes and gradually increase sending to build reputation.

Clean Your Email List

Remove inactive or invalid email addresses regularly.

Avoid Spam Words

Avoid words like:

• “Free money”
• “Guaranteed profit”
• “Click now”

Spam filters can block emails containing suspicious wording.

SMTP vs Self-Hosted Email Servers

Some marketers choose to run their own email servers instead of using SMTP providers.

SMTP Services (Recommended)

• Easy setup
• Reliable deliverability
• Managed infrastructure

Self-Hosted Servers

• Requires technical expertise
• Higher risk of spam blacklisting
• Maintenance required

For most businesses, using a professional SMTP provider is safer and more reliable.

Final Thoughts

Bulk email marketing continues to be one of the most effective digital marketing strategies. However, choosing the right SMTP service can make the difference between successful campaigns and emails that never reach the inbox.

Among the many options available today, the five cheapest and most popular SMTP servers include:

1. Amazon SES – best for ultra-cheap high-volume email
2. SendGrid – great for marketing campaigns
3. Mailgun – ideal for developers
4. Brevo – best all-in-one marketing platform
5. SMTP2GO – reliable and beginner-friendly

Each platform has its strengths depending on your budget, technical expertise, and marketing goals.

If you are sending millions of emails per month, Amazon SES may be the cheapest solution. On the other hand, if you want easy-to-use marketing tools, Brevo or SendGrid may be better choices.

The key is selecting a service that provides strong deliverability, reasonable pricing, and scalability for your business growth.