9 Best SMTP Email Services for Reliable Delivery in 2025

SMTP stands for Easy Mail Switch Protocol. This know-how is finest described because the postal service for emails. That’s as a result of SMTP determines the servers the place your emails will go and the way they get there.

Basically, SMTP determines the success of your e-mail efforts. That is notably essential for manufacturers or companies that ship bulk emails to their shoppers. An SMTP that isn’t configured appropriately can lead to excessive e-mail bounces. Not solely that, however it will probably additionally result in spam stories, which is able to in the end have an effect on your e-mail deliverability.

On this article, we’ll share 9 of the very best SMTP e-mail suppliers, displaying you what measures they take that will help you keep a excessive deliverability charge on your mass e-mail campaigns. 

What’s SMTP?

SMTP, or Easy Mail Switch Protocol, is the know-how utilized by mail servers that will help you ship an e-mail and be certain that it reaches the recipient’s mail servers and is delivered into their inbox quick and reliably. 

SMTP maintains environment friendly e-mail communications. That’s why the know-how is offered each free of charge and as a paid service. For instance, e-mail shoppers like Gmail and Outlook present SMTP free of charge to assist e-mail communications.

Nonetheless, there are limitations to the free SMTP you get from such suppliers. For instance, they’ve every day sending caps, restricted customization choices, and strict anti-spam insurance policies. That’s why, though the free SMTP providers from such suppliers are nice for on a regular basis use, they’re not supreme for companies that send bulk emails.

So, if you’re a enterprise that sends high-volume emails every day, you’ll want a dependable SMTP relay service. 

Let’s discuss these SMTP suppliers subsequent.

What’s an SMTP e-mail service?

SMTP e-mail service suppliers handle the SMTP protocol so that you can be certain that your SMTP servers are arrange appropriately as a way to ship and obtain emails with none issues. 

SMTP suppliers will keep the Easy Mail Switch Protocol to safe your emails and guarantee optimum deliverability whereas adhering to related anti-spam and privateness rules. 

Top-of-the-line issues about SMTP suppliers is that they permit companies to ship emails at scale. Additionally they assist automations and supply customization choices. This helps eCommerce companies ship automated transactional emails, for instance. It additionally allows you to run personalized email marketing campaigns.

Greatest SMTP suppliers in 2025

Beneath are the 9 finest SMTP suppliers available on the market at the moment:

1. GetResponse

GetResponse is a advertising and marketing platform with an e-mail advertising and marketing answer, autoresponders, and different advertising and marketing instruments. Our platform gives SMTP providers by means of the GetResponse Max bundle.

GetResponse Max is a particular bundle tailored for enterprises. This bundle offers you entry to an SMTP server which you can combine together with your eCommerce retailer to ship transactional emails. 

Our answer integrates with varied eCommerce platforms, together with WooCommerce, Magento, Shopify, Shoper, and Zapier. 

Deliverability can also be not a problem with GetResponse. We assure a 99% deliverability charge. And when you’re searching for mass campaigns, GetResponse Max enables you to ship as much as 5 million emails per hour with no drawback. 

The most effective half about utilizing GetResponse Max on your SMTP server wants is that you simply’ll even have entry to different superior advertising and marketing instruments. For instance, it helps superior personalization, segmentation, and automation. 

You’ll additionally achieve entry to AI-powered product suggestions. This tracks and predicts buyer conduct to ship customized suggestions for increased conversions. 

GetResponse options

• Responsive buyer assist – We offer buyer assist by means of 4 channels: reside chat, e-mail, telephone, and Slack. We additionally provide assist in eight totally different languages. Buyer evaluations on G2 reward us for being one of the responsive advertising and marketing platforms.
• Superior safety – Your knowledge is saved on a number of safe servers which can be backed up every day and monitored 24/7. Our platform can also be GDPR and CAN-SPAM Act compliant.
• In depth integrations – GetResponse connects with over 170 enterprise instruments, from eCommerce platforms like Shopify and Magento to cost processing suppliers like Stripe and PayPal. We even have an open API you should utilize for customized integrations.
• Further advertising and marketing instruments – You’ll get entry to superior advertising and marketing instruments like a webinar builder, an AI-powered web site builder, a conversion funnel, and a content material monetization device for course creators.

Establishing the GetResponse SMTP can also be easy. You’ll be able to discover ways to do it on our documentation here.

Pricing

Get in contact with our staff to obtain customized worth tailor-made to your particular wants.

2. Sendgrid

SendGrid gives a cloud-based SMTP service that will help you ship emails at scale whereas sustaining first rate deliverability charges.

The platform gives two SMTP providers. They’ve the SMTP relay providers you possibly can plug into to entry and use their SMTP protocol. Nonetheless, this selection tends to be much less versatile and slower when sending loads of emails.

The second choice is the RESTful API, which may be sooner and extra dependable when sending emails at scale.  

Sendgrid options

• Scalable – SendGrid could be a nice enterprise SMTP supplier as a result of it helps giant volumes of e-mail sends.
• API documentation – The platform gives documentation that will help you with organising the SMTP. Nonetheless, fairly quite a lot of customers have complained that it’s nonetheless not the best SMTP to work with.
• Devoted IP handle – You’ll get a devoted IP handle to handle your sender popularity. It additionally automates IP warmup. However this function is just out there on the $89.95/mo Professional plan.
• Actual-time analytics – Each plan gives real-time knowledge analytics that will help you perceive the efficiency of your campaigns.

Pricing

SendGrid gives a 60-day free trial. Nonetheless, you’ll be restricted to only 100 emails per day throughout this time. 

Paid plans begin at $19.95. This plan pushes your e-mail restrict to between 50,000 and 100,000 per 30 days. Nonetheless, this plan doesn’t embrace devoted IP addresses. 

For devoted IP addresses, you should improve to the Professional plan, which prices $89.95/mo and helps 100,000 to 2.5 million e-mail sends per 30 days. 

The platform additionally gives a Premier plan personalized to your particular wants.  

3. Brevo

Brevo is a advertising and marketing platform with varied options, together with an email marketing tool, SMS & WhatsApp advertising and marketing answer, automation instruments, gross sales platform, and buyer relationship administration.

Among the many different instruments they supply is an outgoing mail server you possibly can connect with and ship your emails. The platform gives SMTP, webhooks, and a RESTful API that will help you ship emails. 

On prime of that, you may get devoted IP addresses that will help you keep a stellar sender popularity for higher e-mail deliverability. 

Brevo additionally helps automation workflows that you should utilize to automate e-mail campaigns primarily based on person conduct. You need to use these automations for SMS and WhatsApp advertising and marketing campaigns. 

Brevo options

• Integrations – Brevo integrates with WordPress and eCommerce platforms.
• E-mail monitoring – The platforms monitor your emails and ship detailed stories to indicate marketing campaign efficiency.
• Drag-and-drop editor – You need to use the visible editor to customise and design emails shortly. Additionally they present a template library with emails for various industries and campaigns.
• Limitless log retention – Logs don’t expire on Brevo.

Pricing

Brevo gives a free SMTP server that helps as much as 300 emails per day. You’ll be able to improve to the paid plans that begin at $9 per 30 days to unlock extra options like 5,000 e-mail sends/mo and 24/7 e-mail assist.

That mentioned, you should spend no less than $16.17 per 30 days on the Marketing strategy if you’d like superior analytics and precedence assist. 

One factor to bear in mind is {that a} devoted IP is offered as a separate add-on, even on the Marketing strategy.  

4. Postmark

Postmark is an e-mail supply service by ActiveCampaign. Among the many a number of options they supply is an SMTP server and e-mail APIs.

Postmark may also help you send transactional emails and different important enterprise emails like password resets and e-mail notifications shortly and reliably. The platform has additionally constructed a number of parallel infrastructures for the totally different e-mail wants. 

For instance, transactional emails usually are not combined with promotional emails. As a substitute, they ship these campaigns on separate sending infrastructures (streams) to reinforce deliverability and safeguard your popularity.

Postmark options

• E-mail API – Postmark gives a well-documented e-mail API that builders can use to ship bulk emails from their functions. This contains the RESTful e-mail API.
• Webhooks – Use webhooks to obtain notifications relating to your campaigns, resembling bounces, opens, clicks, spam complaints, and deliveries.
• Safety – Postmark makes use of a number of security measures to guard your knowledge. They assist 2FA, have safe knowledge facilities, and comply with safety finest practices like superior person permissions and DKIM, DMARC, and SPF assist.
• Rebound – This function means that you can notify customers in your internet app after they attempt to use an e-mail handle that has been marked as inactive. This helps scale back invalid e-mail addresses and optimize deliverability.
• Detailed analytics – You’ll have an in depth analytics dashboard displaying the efficiency of your e-mail campaigns. The info is saved for 45 days by default, however you possibly can scale back or enhance the length to as much as 7 days or three hundred and sixty five days, respectively.

Pricing

Postmark has a free plan that allows you to ship as much as 100 emails per 30 days.

The Fundamental Plan begins at $15 per 30 days. It accommodates as much as 4 customers, 5 servers, 15 streams, and 10,000 month-to-month emails.  

Professional plan prices $60.50 per 30 days and helps 50,000 emails month-to-month, 6 customers, 10 servers, and 30 message streams. 

Lastly, you have got the Platform plan, which prices $138/mo. That plan is designed for giant groups and companies. You get 250,000 emails per 30 days and limitless customers, servers, and message streams. 

Postmark gives a number of options as separate add-ons. For instance, you may get a devoted IP for $50 per 30 days. DMARC monitoring can also be out there for an additional $14/month.  

5. Mailgun

Mailgun gives transactional e-mail supply service and APIs to builders. The platform additionally gives a cloud-based SMTP relay service that helps companies ship SMTP emails with out having to handle their very own SMTP servers.  

The platform helps authentication protocols like SPF, DMARC, and DKIM to keep up the popularity of your model and guarantee inbox placement. 

One limitation with Mailgun is that it requires some technical experience to arrange and use. The entire platform focuses totally on builders, which implies non-tech-savvy people can have a tough time utilizing it. 

Mailgun options

• Actual-time monitoring – The platform tracks e-mail efficiency to ship detailed analytics on bounces, open charges, and clicks. You’ll additionally get logs displaying marketing campaign points.
• Inbound routes – This helps you handle inbound emails significantly better by mechanically grouping incoming auto-replies, forwarding emails that meet a specific rule to a particular handle, and eliminating pointless knowledge. It helps you handle your campaigns extra effectively to make sure vital messages don’t go unanswered.
• Deliverability options – The platform gives extra deliverability options like ship time optimization, e-mail handle validation, and inbox placement testing to optimize your deliverability.

Pricing

Mailgun has a free plan, nevertheless it solely helps 100 emails per day. Paid packages begin at $15/mo. It has no every day restrict and helps as much as 10,000 emails per 30 days. You get two API keys and 5 inbound routes.

The Basis plan prices $35/mo and offers you full entry to RESTful e-mail APIs and SMTP relay. This plan helps 5-day log retention, 50k e-mail sends per 30 days, 1,000 customized sending domains, and full entry to inbound routing. 

Bigger companies and enterprises can use the $90/mo Scale plan to ship 100k emails/month, get SAML SSO, 5,000 e-mail validations, and devoted IP swimming pools.  

6. Amazon SES

You could need to think about the Amazon SES SMTP when you’re already within the Amazon ecosystem. It is likely to be choice when you’re utilizing Amazon Net Providers, for instance. 

The Amazon SES, or Amazon Easy E-mail Service, permits builders to construct e-mail performance into any software to ship bulk emails. It’s very scalable and inexpensive. 

Nonetheless, Amazon SES can also be fairly technical to make use of. It has a reasonably steep studying curve, so it’s not supreme for smaller organizations or groups searching for a DIY choice. This answer is good for larger organizations with technical groups that may arrange and handle the infrastructure.

Amazon SES gives devoted IP addresses that will help you handle your IP popularity. You’ll additionally get a dashboard displaying insights into your sender reputation and e-mail deliverability. 

Whereas Amazon SES is extremely scalable and inexpensive, it’s not supreme for groups that additionally need easy-to-use e-mail advertising and marketing instruments like an e-mail builder and templates.

Source

Amazon SES options

• Digital deliverability supervisor – The digital deliverability supervisor gives suggestions on the way to improve deliverability and cease your emails from ending up within the junk folder. It will probably additionally implement a number of the suggestions mechanically.
• Mail supervisor – Amazon’s Mail Supervisor automates inbound e-mail processing that will help you handle incoming emails effectively. For instance, it helps automated forwarding to ship emails to particular servers inside your group. The supervisor additionally maintains the safety of your e-mail system.
• Sender identification administration and safety – Amazon SES helps a number of e-mail safety requirements, together with DKIM, DMARC, and SPF.
• E-mail receiving – the platform gives e-mail receiving options like selecting what emails to simply accept and the way to handle them as soon as they’re accepted.

Pricing

Amazon SES is offered on a pay-as-you-go mannequin, so that you’ll solely pay for the variety of emails you ship and obtain. However moreover the emails despatched and obtained, additionally, you will be charged individually for different providers just like the mail supervisor, international endpoints, and Amazon Join e-mail.

Devoted IPs are additionally offered as separate add-ons.

7. Mailtrap

Mailtrap gives developer-friendly SMTP providers. For starters, they supply over 25 ready-to-use snippets to assist fast and simple integrations with any software. 

The platform additionally validates all DNS data (DKIM, DMARC, and SPF) mechanically. DKIM keys are rotated each month to keep up sender popularity and deliverability.

Mailtrap options

• E-mail testing – The platform gives a testing atmosphere the place you possibly can seize SMTP visitors and analyze e-mail content material for spam rating and HTML/CSS points.
• Bulk e-mail sending –Mailtrap gives a dependable RESTful SMTP e-mail server to make sure optimum supply of mass emails.
• Customizable templates – You’ll get each a visible drag-and-drop e-mail editor in addition to an HTML editor and e-mail templates to design partaking emails.
• Detailed e-mail analytics – Actionable analytics displaying the efficiency of your campaigns and how one can enhance.
• 30-day logs – You’ll have entry to particulars on despatched emails like occasion historical past, standing, preview, and statistics for as much as 30 days once you’re on the $750/mo enterprise plan. All different plans will nonetheless get logs, however for both 15, 5, or 3 days, relying in your chosen paid plan.

Pricing

Mailtrap gives only one plan that gives API, SMTP, and e-mail advertising and marketing instruments. The paid plans begin at $15 per 30 days. This helps 5,000 contacts and 10,000 e-mail sends per 30 days. 

You will get a devoted IP and auto-warm IP by upgrading to the Marketing strategy, which begins at $85 per 30 days.

Mailtrap additionally gives a free SMTP service by means of their freemium bundle. Nonetheless, this limits you to just one,000 emails per 30 days and 100 contacts. 

8. Mailchimp Transactional

Mailchimp is among the oldest e-mail advertising and marketing providers. The platform gives SMTP and API providers to assist transactional emails. 

These options enable eCommerce companies to course of and ship key emails like password resets, order confirmations, and different campaigns triggered by person actions. 

Mailchimp Transactional E-mail (previously often known as Mandrill) requires you to have the usual or increased month-to-month plan. Which means you can’t pay for the SMTP or API alone. You could even have an e-mail advertising and marketing plan. 

Upon getting a paid plan, you’ll be capable of entry the Transactional E-mail function, which can also be offered as a separate add-on. This is among the drawbacks of utilizing Mailchimp’s SMTP and API; it tends to be fairly costly. That’s why some people find yourself in search of other alternatives to Mailchimp.

Mailchimp Transactional E-mail options

• Automated transactional emails – Ship transactional emails at scale with both the Mailchimp API or SMTP service.
• Course of inbound emails – Mailchimp enables you to obtain, course of, and parse inbound emails. Additionally they present webhooks to reply to e-mail occasions like hyperlink clicks and opens.
• Knowledge analytics – You’ll get actionable insights into your campaigns, like supply charges and subscriber engagement.

Pricing

Mailchimp Transactional E-mail is priced in blocks. You purchase a block the place every block enables you to ship as much as 25,000 emails. A block prices $20 per 30 days once you purchase between 1 and 20 blocks. Pricing drops to $18 per 30 days for 21 to 40 blocks. 

As talked about earlier, you’ll want a Customary or increased e-mail advertising and marketing plan to entry Mailchimp’s Transactional E-mail service. This plan prices $20/mo. 

If you’d like a devoted IP handle, you’ll have to purchase it as an add-on at $29.95 per 30 days.

9. Mailjet

Mailjet gives a strong free SMTP relay service you should utilize to deal with transactional emails. The free server enables you to ship 6,000 emails per 30 days, which is fairly first rate. Nonetheless, there’s a every day cap that allows you to ship solely 200 emails per day. 

The platform gives documentation and tutorials that will help you configure and use the SMTP service inside minutes. Additionally they have servers all around the globe and assist auto-scaling mechanisms that will help you ship emails at scale simply as your wants develop.

Mailjet options

• Simple area authentication – Arrange your SPF, DMARC, and DKIM data to start out sending emails and guarantee inbox placement. The corporate additionally gives a deliverability staff to assist handle your campaigns.
• Actual-time dashboard – Mailjet gives an analytics dashboard that shares real-time knowledge in your marketing campaign’s efficiency. You’ll have knowledge on opens, clicks, unsubscribes, and bounces. You can even use webhooks to get notifications primarily based on particular guidelines or triggers.
• Superior personalization – The platform supports dynamic content, which you should utilize to personalize your e-mail campaigns.

Pricing 

Mailjet’s paid plans begin at $17 per 30 days. This plan removes the 200 emails per day restrict. You’ll be able to ship a complete of 15,000 emails per 30 days. 

The premium plan prices $27 per 30 days. You’re nonetheless restricted to fifteen,000 emails/mo, however you get extra options like dynamic content material, advertising and marketing automations, and superior analytics. The plan additionally helps A/B testing, and also you get one devoted IP handle when you select the 100k emails bundle. 

You can even get a personalized bundle at customized pricing if in case you have particular deliverability wants and wish superior capabilities.

Elements to think about when selecting an SMTP e-mail service

There are many SMTP e-mail suppliers available on the market. Most of them present comparable providers aside from just a few variations right here and there, just like the variety of emails you possibly can ship on the free plan and entry to devoted IP addresses. Pricing packages additionally differ.

So, use the next standards to vet SMTP e-mail service suppliers.  

One of many largest causes behind paying for an SMTP e-mail supplier is to dump the burden of coping with the complicated infrastructure. That’s why you have to be cautious and decide a supplier whose platform is definitely simple to make use of. 

They need to present all of the sources wanted to stand up and working. That features API documentation, an academic onboarding course of, nice studying sources, and a responsive assist staff in case you want knowledgeable assist.

E-mail deliverability determines the share of emails reaching your goal recipients’ e-mail inboxes. The most effective SMTP service suppliers assure a excessive e-mail deliverability charge to make sure your emails don’t find yourself within the junk or spam folder.

Email deliverability is especially vital once you’re sending high-volume emails. It ensures that each e-mail hits the person’s inbox and that your e-mail messages usually are not incorrectly marked as spam, which might damage your sender popularity.  

Even the very best platforms run into points sooner or later. When that occurs, you’ll need to know that the shopper assist staff will probably be responsive and keen to assist.

Due to this fact, select an SMTP supplier with wonderful buyer assist. First, they have to present a number of assist channels. Ideally, you’ll need reside chat, e-mail, and a direct quantity if doable. 

Subsequent, the staff have to be responsive. You don’t need to be stranded for a number of days ready for a reply from the assist staff. These can damage your online business’s backside line, particularly when you’re counting on e-mail for essential communications like transactional emails. 

Undergo the shopper evaluations on unbiased platforms like G2 and Capterra. Take a look at what different customers of that SMTP supplier need to say relating to the customer support.

Pricing is one other important issue it is best to analyze rigorously. Contemplate each your present and future wants. Then, decide an e-mail service supplier that may meet these wants at an inexpensive worth. 

Most SMTP providers present tiered pricing. The worth modifications primarily based on the variety of emails it’s essential to ship and extra e-mail options or instruments. 

For instance, most will cost for devoted IP addresses as a separate add-on. 

Make certain your supplier has clear pricing to keep away from shock costs down the highway. Additionally, most distributors have a tendency to supply promotional costs for first-time consumers. Take a look at the renewal charge to ensure it’s nonetheless inside your funds. 

• Knowledge analytics capabilities

You want correct knowledge to make knowledgeable choices relating to your e-mail campaigns. So, be sure your SMTP platform shares insightful knowledge in your e-mail advertising and marketing campaigns. 

Additionally, keep in mind that some platforms might cost you further to entry in depth knowledge analytics. Issue this into your funds when you’ll want entry to that knowledge. 

What safety measures has the SMTP relay server supplier taken to make sure emails are safe and cling to trade rules? 

On the very least, the supplier ought to assist commonplace e-mail authentication protocols like DKIM, DMARC, and SPF. Moreover, inquire if the supplier has a number of servers for redundant functions to make sure optimum uptimes. 

In closing

SMTP e-mail providers are vital for any group or enterprise that sends mass emails. Consider an ecommerce enterprise that should ship password reset, order affirmation, transport particulars, and different comparable emails.

An amazing SMTP supplier ensures all these emails are despatched on time and are positioned within the recipient’s inbox. Past that, the very best suppliers, like GetResponse, assist automations so you possibly can deal with customized mass campaigns and supply intuitive e-mail editors to design partaking emails with ease. 

Get in contact with our staff to see how GetResponse can assist your SMTP sending wants.