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Postmark vs sendwithus: What are the differences?

Postmark: Email delivery for web apps - done right. Postmark removes the headaches of delivering and parsing transactional email for webapps with minimal setup time and zero maintenance; sendwithus: Email automation for developers + testing and analytics for marketers. Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Postmark and sendwithus can be categorized as "Transactional Email" tools.

Some of the features offered by Postmark are:

  • Create a new virtual server- Instant access to our infrastructure, no waiting required. Create as many servers as you want, for each of your web applications and environments.
  • Drop code into your app- Swap in our SMTP endpoint, or get started with our APIs using one of our send API libraries for Ruby, Rails, .NET, Python, PHP, and more.
  • Send emails and track delivery- A beautiful interface to monitor volume, bounces, spam complaints, and send activity. View full email content to troubleshoot issues.

On the other hand, sendwithus provides the following key features:

  • A/B testing
  • analytics
  • click tracking

"Simple" is the primary reason why developers consider Postmark over the competitors, whereas "Easy setup" was stated as the key factor in picking sendwithus., Docplanner, and are some of the popular companies that use Postmark, whereas sendwithus is used by StackShare, CodeCombat, and Homejoy. Postmark has a broader approval, being mentioned in 67 company stacks & 15 developers stacks; compared to sendwithus, which is listed in 34 company stacks and 5 developer stacks.

Decisions about Postmark and sendwithus

We chose Postmark as our transactional email service for several reasons:

  • Laser-focus (at the time) on transactional email - their success/speed/reliability with delivering transactional email is amazing. Note, they have now branched out and offer marketing/broadcast email services too.

  • Developer-friendly - Awesome docs and resources. Their Rail gem integrates directly with ActionMailer so nearly all of our code worked without changes.

  • Servers - You can set up "Servers" for different mail streams/workflows to keep things separate and easy to review.

  • Bootstrapped - Wildbit (who makes Postmark) is bootstrapped just like the and they offer a service credit to other bootstrapped startups.

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Slawomir Pucia
Head of Product at Coresender · | 5 upvotes · 82K views

Of course we chose Coresender to send our own transactional emails :) So I thought I'll let you know how we use it.

  • We set up separate sending accounts for all company needs, eg. transactional emails, monitoring alerts, time to inbox. We even configured our office printers to send emails through Coresender.

  • We have a real-time and extremely usable view into what emails go through each account, so each time anybody reports an email not arriving we're able to assist them in a few seconds

  • We utilize our message timeline feature, so we can learn eg. if people are clicking on password reset links

  • We always know how many of our onboarding emails are being opened which helps us improve them

  • Finally, we have full controll over our suppressions lists, so we can add (and remove!) from them whenever necessary.

To sum up, at Coresender we're eating our own dogfood and it helps us stay connected to the product and understand our customers better.

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While building our authentication system, we originally picked Mailgun. However, emails took minutes to arrive and some of them didn't get delivered - or got delivered to spam.

We started looking for a new provider, and settled on Postmark. We love that they track time-to-inbox, it makes me feel they really care about going above and beyond to provide a good service.

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Pros of Postmark
Pros of sendwithus
  • 18
  • 10
    Great analytics
  • 8
    Email, done right
  • 5
    Easy setup
  • 5
    Heroku Add-on
  • 2
    Can review sent messages
  • 1
    Very inexpensive
  • 1
    Exceptional support
  • 1
    Pay per message
  • 1
    Great support
  • 10
    Easy setup
  • 8
    Replacement tokens/templated emails
  • 7
    Great analytics
  • 7
    Html template editor
  • 7
    Works with sendgrid/mandrill/mailgun
  • 6
    Free tier
  • 4
    Very responsive and friendly support team
  • 3
    Easy A/B testing
  • 2
    Excellent api documentation
  • 1
    Live database integration
  • 1
  • 1
    Conversion tracking
  • 1
    Redshift integration

Sign up to add or upvote prosMake informed product decisions

Cons of Postmark
Cons of sendwithus
  • 1
    No 24x7 support
  • 1
    Conversions don't quite seem to work

Sign up to add or upvote consMake informed product decisions

What is Postmark?

Postmark removes the headaches of delivering and parsing email for webapps with minimal setup time and zero maintenance.

What is sendwithus?

Send email from your app with a simple API call, Sendwithus manages the rest. Templates, testing, data management, segments, and analytics are all accessible through a friendly dashboard.

Need advice about which tool to choose?Ask the StackShare community!

What companies use Postmark?
What companies use sendwithus?
See which teams inside your own company are using Postmark or sendwithus.
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What tools integrate with Postmark?
What tools integrate with sendwithus?

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What are some alternatives to Postmark and sendwithus?
Mailgun is a set of powerful APIs that allow you to send, receive, track and store email effortlessly.
SparkPost is the world’s #1 email delivery provider. We empower companies with actionable, real-time data to send relevant email to their customers which increases engagement and both top and bottom line revenue.
Twilio SendGrid
Twilio SendGrid's cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. Twilio SendGrid provides reliable delivery, scalability & real-time analytics along with flexible API's.
Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.
Amazon SES
Amazon SES eliminates the complexity and expense of building an in-house email solution or licensing, installing, and operating a third-party email service. The service integrates with other AWS services, making it easy to send emails from applications being hosted on services such as Amazon EC2.
See all alternatives