Mailer To Go vs Postmark (2026): which should you pick?
As of Nov 13, 2026, Postmark grades higher than Mailer To Go: 2.2 against 1.8 out of 4.0.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
Mailer To Go grades higher on value for money. Postmark grades higher on the free plan and features. They get the same grade on ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Mailer To Go
Managed SMTP sending for developers and Heroku apps
Postmark
Transactional email API and SMTP, with broadcasts on a separate stream
Which one is for you
Pick Mailer To Go if
- Fits if you run an app on Heroku and want SMTP email
- Works for developers who are fine with SMTP and no REST API yet
Look elsewhere if
- Not for you if you want a free plan, as there isn't one
- Skip it if you need a REST API, which is still in development
- Tight if you add a dedicated IP, which is $30 a month on Growth and Scale
- Watch out: plans bought through Heroku, Addons.io or Build.io are billed and priced separately
Pick Postmark if
- Fits if you want password resets kept on a separate stream from your newsletters
- Works for apps that need to look back at exactly what an email said weeks later
Look elsewhere if
- Pricey if you send 50,000 emails a month, at $55 with no yearly discount
- Skip it if you want a free plan to run a small app on, as it's 100 emails a month with no tier until 10,000
- Tight if you're on Basic, with 4 users, 5 sending domains and no inbound email
- Not for you if you want a dedicated IP below 300,000 emails a month, and each one is $50 a month on Pro or higher
- Watch out: DMARC reports are an add-on from $14 a month per domain
How we grade them
| 1.8GPAMailer To GoWeak | 2.2GPAPostmarkFair | |
|---|---|---|
| Value for money | CStarter is $15 a month for 25,000 emails, the middle of this category's prices. Extra email is $1.00 per 1,000, and a dedicated IP is $30 a month. | DGraded on 50,000 emails a month: $55 on Basic or $60.50 on Pro, billed monthly only. That's the dearest in this category at that volume, roughly twice the middle. Bootstrapped companies can ask for $75 of credit. |
| Free plan and trial | FNothing free: there is no free plan or trial, so every plan is paid from day one. | CA free developer plan that never expires and needs no card, but it's 100 emails a month with no way to buy more. That's for testing an integration, not running an app. |
| Features | CSMTP sending, delegated DNS, suppression handling, delivery webhooks and inbound routing. The REST API is still in development, so sending today is SMTP only. | BAPI and SMTP with SDKs, separate streams for app and bulk email, inbound email turned into JSON, templates, 45 days of message history and DMARC reports as an add-on from $14 a month. It covers the job; inbound needs Pro. |
| Ease of use | CNo store rating on record. It takes sending domains and DNS to set up, but it is a plain SMTP service. | CJudged on how fast a developer sends a first email: official SDKs, a sandbox mode, ready-made templates for resets and receipts, and migration guides. You'll still verify a domain first. No rating on record. |
| Platforms and integrations | BWeb, SMTP, and Heroku, Addons.io and Build.io add-ons, plus Rails, Django, Laravel and Nodemailer guides. No apps. | BWeb, with an API and SMTP, plus Zapier, WordPress, Stripe, Slack, Supabase, Bubble, Netlify and Datadog. No desktop or phone app, so B is the top. |
| Best for | SMTP sending for developers on Heroku or anywhere | app email kept apart from marketing sends |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Mailer To Go and Postmark. How we grade
Price against what you get
Mailer To Go starts at $15 a month and scores 2.3 out of 4 on features, ease of use and platforms. Postmark starts at $15 a month and scores 2.7.
Postmark scores higher for the same starting price. Of the other email sending services on the chart, 7 score higher than Mailer To Go for less, and none scores higher than Postmark for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- Postmark also covers dMARC.
At a glance
| Mailer To Go | Postmark | |
|---|---|---|
| Pricing | Paid | Free plan |
| Starts at | $15 per month for 25,000 emails | $15 per month for 10,000 emails |
| Free plan | None | Free developer plan: 100 emails a month with no expiry and no overages, for testing an integration or a small side project. No credit card needed. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Sidebored.io, Inc. | ActiveCampaign, LLC |
| Price read from | mailertogo.com | postmarkapp.com |
| Checked | Nov 13, 2026 | Oct 18, 2026 |
Worth knowing
Mailer To Go
- There is no free plan; every plan is paid.
- The pages say a REST API is in development, so sending today is over SMTP.
- A dedicated IP is a $30 per month add-on on Growth and Scale, on request.
- Plans bought through Heroku, Addons.io or Build.io are billed there and priced separately from the direct plans.
Postmark
- There is no tier between the free 100 emails a month and the 10,000-email paid plans.
- Billing is monthly only; the FAQ says annual plans are not offered yet.
- Basic has no inbound email processing and caps users at 4 and sending domains at 5.
- Dedicated IPs start at $50 a month per IP, need Pro or higher and 300,000 emails a month or more.
Key features
Mailer To Go
- SMTP sending
- Standard SMTP on port 587 (STARTTLS) or 465 (SSL), so framework mailers work by pointing them at the dashboard credentials.
- Delegated DNS
- Publish one NS record and the service publishes and rotates SPF, DKIM and DMARC records for a dedicated sending subdomain.
- Suppression handling
- Hard bounces and spam complaints are added to a suppression list automatically.
- Delivery webhooks
- Webhook URLs receive delivered, bounced, opened and clicked events.
- Inbound routing
- Inbound mail can be forwarded by rule or delivered to an app as a webhook.
- Marketplace add-ons
- Available as an add-on on Heroku, Addons.io and Build.io, which sets SMTP credentials as config variables.
Postmark
- Email API and SMTP
- Send through a REST API with official SDKs or through SMTP, with batch sending, a sandbox mode and migration guides from other providers.
- Message streams
- Transactional and bulk or broadcast email run on separate sending infrastructure, so marketing sends do not affect password resets and receipts.
- Inbound email processing
- Pro and Platform turn incoming email into a JSON object and post it to a webhook URL your app handles.
- Templates
- Responsive templates for welcome emails, password resets and receipts, with a template editor and import tool.
- Message history and analytics
- 45 days of full message content by default, adjustable from 7 to 365 days, with bounce details, open and link tracking and a stats API.
- DMARC monitoring
- DMARC Digests reports show authentication problems and who is sending with your domain, sold as an add-on from $14 a month per domain.
Plans
Mailer To Go
Starter$15
per month for up to 25,000 emails, billed monthly
5 sending domains, 30 days of event history, email support. Extra email is $1.00 per 1,000.
Growth$50
per month for up to 250,000 emails, billed monthly
25 sending domains, 90 days of event history, priority support. Extra email is $0.60 per 1,000.
Scale$150
per month for up to 1,000,000 emails, billed monthly
Unlimited sending domains, 12 months of event history, priority support. Extra email is $0.40 per 1,000.
Postmark
Free$0
100 emails a month, never expires; extra emails cannot be bought on this plan.
Basic$15
per month for 10,000 emails
5 sending domains, 4 users, 45 days of history, no inbound email. Extra emails $1.80 per 1,000; $55 a month at 50,000 emails.
Pro$16.50
per month for 10,000 emails
10 domains, 6 users, inbound email, retention up to 365 days. Extra emails $1.30 per 1,000; $60.50 a month at 50,000 emails.
Platform$18
per month for 10,000 emails
Unlimited domains, servers, streams and users, with inbound email. Extra emails $1.20 per 1,000; $66 a month at 50,000 emails.
High volumeCustom
Custom pricing for large senders, arranged through sales.
Ways to pay less
Mailer To Go
- Annual discount
20% off with annual billing
The plans page says annual billing saves 20% on the direct plans.
Postmark
- Startups
$75 credit for bootstrapped companies
Companies that have launched, are charging for their product and have taken no outside investment can ask support for $75 of account credit.
Common questions
Which is cheaper, Mailer To Go or Postmark?
As of Nov 13, 2026, they start at the same price. Mailer To Go starts at $15 per month for 25,000 emails, and Postmark starts at $15 per month for 10,000 emails.
Which has a free plan, Mailer To Go or Postmark?
As of Nov 13, 2026, only Postmark has a free plan. Mailer To Go does not.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.