The Best Postmark Alternatives for Sending SaaS Emails (2024)

Looking for a better alternative to Postmark? Need to deliver not only transactional emails but also sent product updates and newsletters? And set up a welcome email sequence or prevent churns with email automation? You’re in the right place. We’re bringing you a detailed comparison between Postmark and other email providers for 2024.

First, let’s tackle the obvious question… Yes, Sidemail is an alternative and competitor to Postmark. Yes, we wrote down this comparison of email providers. From talking to people like you who migrated from various email providers, we know well about the struggles. At the end of the day, we also were at the point where you are now. We had a SaaS company and needed to deliver its emails. No service was good enough. Sidemail was built to change that. Now, we’re helping online businesses all around the world to make the whole email game easier.

Postmark alternatives comparison

See the tables below for a structured overview of Postmark alternatives and their key features and pricing.

Features & Specs:

(+ Mailjet)
SendgridAmazon SESMailchimp
(+ Mandrill)
Transactional emails
Yes Yes Yes Yes YesSeparate pricing
Marketing emails
Very limited Yes YesSeparate serviceSeparate pricing Yes
Email automation
No YesSeparate serviceSeparate pricing No Yes
Contact profiles management
No Yes Yes Yes (with Marketing plan) No Yes
Subscribe forms
No Yes Yes (with Mailjet plan) Yes (with Marketing plan) No Yes
Number of contacts
Unlimited UnlimitedLimited, depends on tierLimited, depends on tier
Number of team members
Unlimited UnlimitedUnlimited on Mailgun,
10 on Mailjet
Default is 1
1,000 on Pro plan (starting at $89.95/mo)
unlimited on Premium plan (starting at $350/mo)
Standart data history
45 days90 days3 days3 days
7 days on Pro plan (starting at $89.95)
030 days
Included in all plans Included in all plansTiered on both Mailgun and Mailjet plansPersonalised support available after additional purchaseOffered as a paid add-on Included in all plans, except the free plan
Visual editor
No Yes Yes Yes No Yes
Premade templates
Yes Yes YesOnly for marketing emails NoOnly for marketing emails
Based in
🇺🇸 US🇪🇺 EU🇺🇸 Mailgun US
🇪🇺 Mailjet EU
🇺🇸 US🇺🇸 US🇺🇸 US
Postmarkapp Sidemail Mailgun SendGrid Amazon SES Mailchimp


(+ Mailjet)
SendgridAmazon SESMailchimp
(+ Mandrill)
Monthly email quota
Transactional onlyAll-in-oneTransac.Market. + AutoTransac.Market. + AutoTransactional + MarketingTransac.*Market. + Auto
*plus the price of marketing plan
Transac. = Transactional emails, Market. = Email marketing, Auto. = Email automation

About Postmark

Postmark is an email delivery platform mainly focusing on transactional emails. It is based in Chicago, Illinois. Postmark was a bootstrapped company founded in 2009 by two co-founders. After years of running the company together, the founders decided to step away and sold Postmark to ActiveCampaign in May 2022.

Postmark does not offer software for email automation. For email marketing, in May 2023 they introduced Broadcast Streams, but the functionality is very limited. So, if you need to cover all email delivery, you have to find another email marketing and automation service or choose an alternative from the list below that has an all-in-one solution.

Postmark website image

👍 Postmark Pros

  • Responsive support. Postmark is known for its solid support experience.
  • Solid delivery of transactional emails
  • Unlimited team members
  • Offers a complete self-serve option
  • Integrations with some popular marketing and management platforms. Postmark can be integrated for example with Active Campaign, Mailcoach, Craft Campaign, etc.

👎 Postmark Cons

  • Missing functionality for email marketing and automation. If you have a SaaS and need a service to cover all your email-sending activities, you have to find another email marketing and automation service. It lacks features for writing product updates, sending automated emails, setting up welcome email sequences, contact management, and collecting new subscribers.
  • No visual editor. Postmark does not have a visual editor for email templates. To create your templates, you have to write the code yourself. And coding emails that do not break is a tough and resource-expensive job.
  • Support unavailable on weekends. The support team is available only between 3 am and 7 pm EST, Monday to Friday, not on weekends.
  • No yearly plans

💰 Postmark Pricing

Postmark has monthly plans‑based pricing with a free trial.

100 emails per month are free. Then, the paid plans start at $15 per month.

1. Sidemail

Sidemail is the most SaaS-focused Postmark alternative from this list. Compared to Postmark, Sidemail is an all-in-one email delivery platform and covers everything for delivering and managing emails in one package – transactional emails, email marketing, email automation, contact profiles management, and subscribe forms. Sidemail was founded in 2018 and is based in the EU.

Sidemail website image

👍 Sidemail Pros

  • All-in-one email platform. It offers everything for transactional emails, email marketing, and automation.
  • Specialization in SaaS email delivery
  • Quick integration. The whole process takes about 30 minutes.
  • Premade email templates and visual template editor
  • Yearly plans available
  • Personal care and pro-customer approach

For more details and a comparison between Postmark, check the section Postmark vs Sidemail detailed comparison.

👎 Sidemail Cons

  • Not offering a free plan. In email delivery, offering top-quality service and a free plan does not always go well together. To maintain the fastest email delivery and the highest service standards, we decided to pass the free plan and instead offer 7 days as a free trial for testing.
  • “Different” approach. Sidemail's main focus is to bring the best email delivery service for SaaS companies and online businesses. It simplifies the whole email game for them so they can focus on their business and not invest tons of resources in emails. However, this approach might not be suitable for others. If you are an offline business or need advanced functionality just for email marketing, other alternatives listed below might be a better solution for your case.

💌 But! If you’re missing a feature that you think others could also benefit from, let us know at We are happy to discuss your ideas.

👉 TL;DR: Postmark vs Sidemail Conclusion – What To Choose

Overall, Sidemail is the perfect alternative to Postmark if want to manage everything from one place, don’t want to code email templates for yourself, and prefer a simple and uncomplicated solution.

Also, if you have a SaaS, Sidemail will be the best solution for you as it is recognized as a top email platform for SaaS. What developers and business owners appreciate the most is its easy integration, intuitive UI, and amazing customer care.

On the other hand, if you need a more low-level email service with advanced functionality, other alternatives listed below might be a better solution for your case.

Postmark vs Sidemail Detailed Comparison – What It Solves

⭐ All-in-one platform (transactional emails & email marketing combined)

With Postmark, you have to pay for two separate services – Postmark for transactional emails, and another service for email marketing and automation.

Sidemail as a Postmark alternative covers everything in one complete package. You do not have to pay for two separate services or limit yourself to what features you want to use. All Sidemail plans include everything you need for delivering transactional and marketing emails, sending product updates, setting up email automation, collecting your subscribers' information, and managing your contacts. Everything is nicely packed in one neatly organized place.

⭐ Intuitive UI & quick integration

Sidemail was built with first principles in mind. It’s one of the most simple yet complete Postmark alternatives.

With Sidemail the whole integration process takes about 30 minutes. Sidemail is known for its clean and intuitive UI. To write a product update is as simple as writing a message in Gmail, yet comes with all essential features like scheduled delivery, delivery by recipients’ timezones, email variables, recipient segmentation, etc.

⭐ From developers to developers

After Postmark was sold to ActiveCampaign in 2022, it lost its main moving force – Postmark founders that drove the development since its beginning.

Sidemail’s founders, developers themselves, continuously push the boundaries and focus on developing features that make the work of other developers and product owners easier. To name one of the recently added features, Sidemail came with the possibility to send email content with markdown making it one of the easiest ways to deliver beautiful branded emails on the market. You can read more here.

⭐ Personal approach & flexibility

Sidemail is an independent company with a strong background and a flexible team, which enables us to adapt quickly to new trends and offer a truly individual approach. We're pleased to continually work side-by-side with our customers to develop additional features based on their specific needs while improving the whole product for everyone.

2. Mailgun (+ Mailjet)

Mailgun is a close Postmark alternative. Similarly to Postmark, Mailgun is an API-first solution. With its solid solution for transactional emails, Mailgun was a popular choice for developers in previous years.

Today, after a number of acquisitions in 2021, Mailgun is a part of Sinch company. Sinch company now also owns Mailjet which you can use for email marketing and email automation. Even though they are part of a large enterprise now, both Mailgun and Mailjet are still standalone services. So if are looking for a solution for sending all your emails, you will need to pay for two separate services.

Mailgun website image

👍 Mailgun Pros

  • Pay-as-you-go option that you can activate before you find a monthly plan that fits your sending needs.
  • Solid functionality for managing transactional emails
  • 99.99% uptime SLA offered even on lower plans

👎 Mailgun Cons

  • Uncertain deliverability results. Some customers reported issues with the deliverability and sending speed of their transactional emails.
  • Mixed customer support ratings. In the last 3 years, there is a notable rise in customers that report frustrating experiences with Mailgun support team.
  • You need to pay for 2 separate services for transactional emails and email marketing. Combined, it is a more expensive solution compared to providers that include transactional emails and marketing + automation in one service.

💰 Mailgun Pricing

Mailgun as a Postmark alternative offers a similar pricing model. It has monthly plans‑based pricing with a free trial.

If you want to send both transactional emails and email marketing + automation, you need to pay for 2 separate services. Mailgun plans (for sending transactional emails) start at $35 per month.

Mailjet plans (for sending marketing emails and email automation) start at $25 per month.

3. Sendgrid

SendGrid is one of the largest Postmark alternatives, mainly focusing on sending transactional emails, now also providing broad-spectrum of services for email marketing and email automation. The company was founded in 2009 and is based in Denver, Colorado. As one of the oldest email providers, it’s used by large tech companies like Uber,, Yelp, Spotify or Airbnb. In 2019 SendGrid was acquired by Twilio.

SendGrid website image

👍 Sendgrid Pros

  • One of the oldest and largest platforms for email delivery
  • Free plan with basic functionality
  • Advanced features for testing & email analytics
  • Broad-spectrum of tools and integrations not only for email delivery but also for SMS and WhatsApp.

👎 Sendgrid Cons

  • Occasional issues with deliverability. Since the acquisition in 2019, there has been a notable rise in customer complaints regarding issues with email deliverability and quality of support, resulting in a significant increase in negative reviews.
  • Bad support experience reported by many customers even on paid add-on plans.
  • No premade email templates for transactional emails
  • Complicated pricing with a lot of add-ons and extra fees for features.

💰 SendGrid Pricing

Twilio SendGrid has freemium pricing. If you want to send both transactional emails and email marketing + automation, you need to pay for 2 separate plans.

For sending transactional emails Sendgrid offer a free plan with 100 emails/day and limited functionality. Paid Essentials Transactional plan starts at $19.95 per month. The Pro plan which includes more than 1 team member, 7 days of data history, and 1 dedicated IP starts at $89.95 per month.

For sending marketing emails and email automation Sendgrid also offer a very limited free plan. Then there are two paid plans – Basic and Advanced. With the Basic plan, you can not set up any email automation. The Advanced Marketing plan starts at $60 per month and includes both email marketing and email automation and up to 15 subscribe forms.

4. Amazon SES

Amazon SES is the cheapest alternative to Postmark by far. It is a part of Amazon Web Services and as its name SES “Simple Email Service” states, it offers the most simple and low-level service from all the alternatives on the list. For its robust infrastructure and reliable delivery, it’s trusted by giants like Netflix, Reddit, and Duolingo.

Amazon SES focuses on the technical side of email sending and offers only a very basic dashboard. As it is more a developer tool than an end-to-end product, it’s suitable for integrations with robust systems that need a lot of flexibility and for companies that can allocate a great amount of resources to developing their own email solution.

Amazon SES website image

👍 Amazon SES Pros

  • The cheapest alternative with a Pay-as-you-go pricing model
  • The most robust architecture
  • Fast and reliable email delivery

👎 Amazon SES Cons

  • Do-it-yourself approach. It requires a lot of manual effort from your site to get things running. Amazon provides you with low-level tools for email delivery, but all the integration, email template setup, troubleshooting, analytics, etc. is up to you.
  • No support included
  • No out-of-the-box features like template editor, premade templates, message history, email automation, or contact management.

💰 Amazon SES Pricing

Amazon SES has pay-as-you-go pricing.

If you count emails only, it is the cheapest Mailgun alternative by far. 1000 emails cost $0.1.

5. Mailchimp (+ Mandrill)

Mailchimp is the most expensive Postmark alternative from this list. As the opposite of Postmark, it is an email marketing first platform. In 2016 Mailchimp merged with Mandrill and started offering also transactional emails as a Mandrill paid add-on. In 2021 Mailchimp was acquired by Intuit and become a part of their global technology platform. Following the acquisition, Mailchimp suffered a number of data breach incidents in 2022 and 2023.

If you are looking for a solution with advanced features for email marketing, Mailchimp could be a good solution for you. But for transactional emails, the functionality might not be as good as Postmark and other alternatives listed above.

Mailchimp website image

👍 Mailchimp Pros

  • Advanced email marketing features
  • Landing page builder included
  • Solid free plan for email marketing

👎 Mailchimp Cons

  • The most expensive alternative.
  • Uncertain transactional emails. Even though Mailchimp now offers plans not only for email marketing but also for transactional emails, since the Mailchimp + Mandrill acquisition, it seems like the transactional part of the product is not receiving much focus and development. Some former Mandrill customers report technical issues with the delivery and are migrating to other alternatives.
  • Previous data breach issues. Following the Intuit acquisition, Mailchimp suffered a number of data breach incidents in 2022 and 2023.

💰 Mailchimp Pricing

Mailchimp is the most expensive Postmark alternative. It has monthly plans-based pricing with a free email marketing plan.

If you want to send transactional emails, you have to pay for a Standard or Premium marketing plan + purchase Transactional email as an extra add-on. The transactional email costs start at $20 per month.

For email marketing, Mailchimp offers a free plan with up to 500 subscribers and 1000 emails sent per month. The Standard marketing plan starts at $20 per month.

Choosing an Postmark Alternative

I hope this detailed overview of Postmark alternatives gave you a better overview of what would be the right option for you. All of the listed Postmark alternatives offer at least a basic functionality for sending transactional emails (and email marketing). From there, it is a matter of what approach you prefer and what are the specifics of your use-case. If you have questions or need help with your email delivery, feel free to reach us at

👉 Try Sidemail today

Dealing with emails and choosing the right email service is not easy. We will help you to simplify it as much as possible. Create your account now and start sending your emails in under 30 minutes.

Start 7 day free trial →

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