Is SMTP Server Free?

Sending emails is a critical function for most businesses and organizations. A Simple Mail Transfer Protocol (SMTP) server allows you to send outgoing emails from your domain. But is using an SMTP server free? Here is what you need to know about SMTP and your email delivery options.

Is SMTP Server Free?

What is an SMTP Server?

An SMTP server is a server used for sending outgoing emails. It is responsible for routing your messages to the correct recipient servers.

When you compose an email in an email client like Gmail or Outlook, your email application does not send the message directly. Instead, it connects to an SMTP server, which then sends the email on your behalf.

The SMTP protocol defines a set of rules for formatting messages and transferring them between mail servers. Popular implementations of SMTP servers include Postfix, Sendmail, and Microsoft Exchange Server.

Features of an SMTP Server

An SMTP server provides the following key features for sending emails:

  • Message routing – Routes outgoing emails to the recipient’s email server based on their address.
  • Deliverability – Manages queues of messages and attempts to deliver emails to the recipient’s server.
  • Security – Supports encryption and authentication to secure email delivery.
  • Scalability – Handles large volumes of email traffic.
  • Monitoring – Tracks metrics like emails sent, delivery failures, spam, etc.
  • Webmail access – Provides a web interface to access and send emails.

Why Do Businesses Need an SMTP Server?

There are a few reasons businesses need to run their own SMTP server:

  • Deliver emails from your domain – An SMTP server allows you to send emails from addresses using your company domain name (e.g. [email protected]).
  • Improve deliverability – Your own SMTP server gives you more control over email deliverability than relying on an ISP’s SMTP servers. You can configure it to optimize deliverability.
  • Enhance security – Running your own SMTP server allows you to add security features like DMARC, DKIM, and SPF to prevent email spoofing and phishing.
  • Access metrics – An SMTP server provides metrics to track email volume and delivery success rates to monitor performance.
  • Flexibility – You have more control over configuration options like throttling, storage limits, etc.
  • Cost savings – After initial setup costs, maintaining your own SMTP server can cost less than paying a third-party provider.

Is Using an SMTP Server Free?

There are both free and paid options for running an SMTP server for your organization.

Free SMTP Servers

Here are some ways to get free or open-source SMTP services:

  • Your ISP’s SMTP server – Most ISPs like Gmail, Outlook, Yahoo provide free outbound SMTP servers for their users. However, deliverability and security may be limited compared to running your own server.
  • Mailgun – Provides 10,000 free emails per month for startups and small usage. Requires a credit card but doesn’t charge if under usage limits.
  • Amazon SES – Lets you send 62,000 emails per month for free on new accounts. Additional emails are charged per 1000.
  • Mailjet – 6,000 emails per month free for small usage. Credit card required.
  • SendinBlue – 9,000 emails per month free for individuals and small businesses. Credit card required.
  • Open-source SMTP servers – Options like Postfix, Sendmail, and qmail can be installed on your own servers for free. But you need to maintain the servers and infrastructure yourself.

While these free services can meet light email needs, they have limitations on security, customization, and features compared to paid SMTP solutions. As your email volumes grow, lack of throttling control can also become problematic.

Paid SMTP Services

For business-grade email delivery, paid SMTP server solutions provide advantages like:

  • Higher limits for emails per month
  • Guaranteed uptime and support
  • Dedicated IP addresses for your domain
  • Advanced security and anti-spam tools
  • Detailed email tracking and analytics
  • High deliverability rates
  • Integrations with email marketing and automation tools

Some popular paid SMTP providers include:

  • SendGrid – Plans start at $15/month for up to 40,000 emails. Higher tiers for more volume.
  • Mailjet – Starts at $11/month for 6,000 emails at lowest tier. Supports up to 200,000 emails per month.
  • Mailgun – From $35/month for 10,000 emails on a dedicated IP. Higher plans for more features and capacity.
  • SendinBlue – Plans from $25/month for 9,000 emails. Supports additional volume at higher pricing.
  • Amazon SES – Costs $0.10 per 1000 emails sent. High deliverability rates.
  • Postmark – Starts at $11 per month for 25,000 emails. Reliable deliverability.
  • Mail Channels – Plans start at $99/month for 100,000 emails on a dedicated IP.

The paid SMTP services listed above all offer high deliverability rates backed by SLAs along with scaling to much higher email volumes. Features like dedicated IPs and analytics help enhance your email program.

Recommendations for SMBs and Enterprises

Here are some recommendations on selecting an SMTP provider based on your company size:

Small Businesses

For small businesses sending less than 100,000 emails per month, the free tiers of SMTP services like SendinBlue, Mailgun, Mailjet, or Amazon SES provide a cost-effective way to get started.

Using your ISP’s SMTP server may also meet your needs depending on volume and deliverability requirements.

As your email programs mature, evaluate shifting to a low-cost paid service like SendGrid or Mailgun for greater reliability, performance, and security.

Medium/Enterprise Businesses

Medium and enterprise organizations sending over 100,000 emails per month should use a paid SMTP provider.

Options like SendGrid, Mailgun, Mailjet and Amazon SES provide the right mix of affordability, performance and dedicated IP addresses suitable for larger businesses.

For companies sending millions of emails per month, scaling up to more advanced tiers or enterprise plans offered by providers is recommended to handle the load.

More customized and managed SMTP solutions from cloud email providers may also suit larger organizations. The added support can help maximize email deliverability.

Key Considerations for Picking an SMTP Provider

Here are some key factors to evaluate when choosing an SMTP service for your company:

  • Email volume – Consider the number of emails sent per day/month. Pick a provider that fits your current and expected usage.
  • Deliverability rates – Look for reliable deliverability with inbox placement and low bounce rates.
  • Uptime guarantees – Choose a service with high reliability and uptime, backed by an SLA.
  • Reputation – Providers with good reputations deliver to more inboxes. Review reports on return path and domain reputation.
  • Security features – SSL/TLS encryption, authentication, DMARC, DKIM and SPF support.
  • Support options – Knowledgeable email deliverability experts and customer support agents.
  • Scalability – Ability to upgrade plans to support increasing email volumes.
  • Integrations – API and integration support for your CRM, email services, etc.
  • Cost – Compare pricing of providers based on features offered at each tier.

Prioritizing these factors will help you select the ideal SMTP provider for your specific business needs, budget, and technical capabilities.

Key Takeaways

  • An SMTP server allows you to send outgoing emails from your domain by routing messages to recipients’ email servers.
  • Free SMTP options from ISPs, Mailgun, Amazon SES, and others can meet basic email needs but have limitations.
  • For business email delivery, paid services like SendGrid and Mailjet provide better deliverability, scalability, and tracking.
  • Small businesses can start with free tiers then upgrade to affordable paid plans as their needs grow.
  • Larger companies should use dedicated, paid SMTP services to handle their high email volumes reliably.
  • Evaluate options based on email volume, deliverability, security, support, cost, and integrations offered.


While free SMTP servers are available, they impose limits unsuitable for business use-cases. As a business grows beyond basic transactional email, using a paid SMTP provider gives you the power and visibility needed to scale your email campaigns and keep your messages out of the spam folder.

Investing in a reliable SMTP platform with strong security, deliverability and support ensures your ability to engage customers through email will not be blocked by technical delivery issues. The right provider can help you maximize the return from your email marketing efforts.

Frequently Asked Questions

What is an SMTP server and how does it work?

An SMTP server acts as a relay for outgoing emails. When an email client wants to send a message, it connects to the SMTP server using the SMTP protocol. The server then takes on the duty of delivering the email to the recipient’s mailbox on their email service.

Do I need an SMTP server to send emails?

You need access to an SMTP server to send emails from domain-based email addresses. Using an external SMTP provider allows you to optimize deliverability beyond what’s possible with a basic ISP-provided server.

What are the advantages of using a paid SMTP service?

Paid SMTP services offer benefits like dedicated IP addresses, improved deliverability and inbox placement, higher sending limits, advanced security and antispam tools, detailed analytics tracking, and knowledgeable support teams.

How much do SMTP services usually cost?

Paid SMTP services start around $10-15 per month for basic plans, going up to several hundred dollars monthly for enterprise-level solutions. Most charge based on the number of emails sent per month. Amazon SES charges per 1000 emails.

What should I look for in an SMTP provider for a small business?

For a small business, prioritize deliverability rate, ease of use, email volume allowance, and cost. Start with a basic paid plan from a reputable provider like SendGrid or Mailgun, then scale up over time.

How do I choose an enterprise SMTP provider?

For large enterprises, SMTP capabilities like high volume email sending, dedicated IPs, and strong performance SLAs are critical. Also prioritize advanced security, real-time analytics, and integrations with other communication platforms.

Is using a free SMTP server secure?

Free SMTP servers often lack advanced security protections. Using reputable paid providers that implement DMARC, DKIM, SPF and other email security best practices results in more secure email delivery.

What are typical email volume limits for free vs paid SMTP servers?

Free SMTP services often limit you to less than 10,000 emails per month while paid services start between 10,000 to 100,000 emails for basic plans. Higher pricing tiers support unlimited email volumes.

Can I use my ISP’s SMTP server instead of a third-party provider?

In some cases your ISP’s SMTP servers may accommodate your email needs. But deliverability and security may be weak compared to dedicated SMTP providers optimized for transactional and marketing emails.

Which SMTP providers have the best deliverability rates?

SendGrid, Mailgun, Amazon SES and Mailjet are regarded as having excellent inbox placement and deliverability rates of around 97% or higher. But any reputable paid SMTP provider should help maximize email delivery.

Do SMTP services integrate with email marketing platforms?

Yes, leading SMTP providers offer integrations with email service providers like Mailchimp, Constant Contact, GetResponse, and Campaign Monitor. APIs allow connecting your CRM and marketing automation tools as well.

Can I switch SMTP services easily if needed?

Switching SMTP providers just requires updating your DNS records and email server settings, which can be done in minutes. Most also help you migrate any blocked or suppression lists to optimize deliverability.

Is SMTP Server Free? – Article Summary

  • An SMTP server allows sending outgoing emails by routing messages to recipients’ inboxes.
  • While some free SMTP services exist, paid options offer critical advantages for business use like dedicated IPs, high deliverability, scalability, and tracking.
  • Small businesses can start with affordable paid plans from providers like SendGrid or Mailgun, then upgrade as email needs grow.
  • For large enterprises, robust SMTP servers that handle high volumes are essential, even at higher costs.
  • Evaluate SMTP providers based on volume needs, deliverability, security, support, integrations, and cost.
  • Investing in a reliable paid SMTP platform ensures deliverability at scale and maximizes the value of email marketing efforts.

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