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The Mailer To Go Insider’s Guide

Everything we know about Mailer To Go in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.

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ToolGPANovember 2026

Mailer To Go

The Insider’s Guide

Managed SMTP sending for developers and Heroku apps

Every plan, grade, refund rule and rival among email sending services, read from Mailer To Go’s own pages.

Made by Sidebored.io, Inc. · checked Nov 13, 2026 · toolgpa.com

1.8GPA

Contents

  1. 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
  2. 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
  3. 03What it doesIts main features, where it runs, what it works with and who makes it
  4. 04Where it standsIts grades against its category, and whether to keep it or make your own
  5. 05The alternativesThe tools it is most often weighed against, side by side
  6. 06Quick answersThe questions people ask about it, each answered in a line or two
  7. 07About ToolGPAWho made this guide, what else is on the site, and how to cite it

ToolGPA put this guide together from Mailer To Go’s own pages, its app-store listings and our grades. Every fact in it is on Mailer To Go’s page too, where it is kept up to date. Checked Nov 13, 2026.

Part 01 · Overview

Welcome

What it is, who it suits, its grades and the ten things to know first

1.8

GPA, above 4 of the 50 other email sending services we grade

Mailer To Go is a transactional email service for developers that sends over SMTP, with webhooks for delivery events and inbound routing. A REST API is listed as in development. It is also sold as an add-on on Heroku, Addons.io and Build.io.

To get you started, here are 8 things to know about Mailer To Go, taken from its own pages and our grades.

It takes sending domains and DNS to set up, but it is a plain SMTP service.
From our grade for ease of use
  1. 1

    Best for SMTP sending for developers on Heroku or anywhere

    There is no free plan, and the REST API is still listed as in development.

  2. 2

    Paid plans start at $15 a month

    As its pricing page puts it: $15 per month for 25,000 emails.

  3. 3

    It runs on Web

    Web.

  4. 4

    SMTP sending

    Standard SMTP on port 587 (STARTTLS) or 465 (SSL), so framework mailers work by pointing them at the dashboard credentials.

  5. 5

    Delegated DNS

    Publish one NS record and the service publishes and rotates SPF, DKIM and DMARC records for a dedicated sending subdomain.

  6. 6

    Suppression handling

    Hard bounces and spam complaints are added to a suppression list automatically.

  7. 7

    A 1.8 GPA, above 4 of 50

    That is against the other email sending services we grade, on value, the free plan, features, ease of use and platforms.

  8. 8

    Keep it

    To replace Mailer To Go you would be making mail servers with a good name among inbox providers. That is not a weekend's work, with an AI app builder or without one.

Mailer To Go at a glance

Pricing
Paid, from $15 per month for 25,000 emails
Free plan
No
Free trial
None stated
Runs on
Web
Made by
Sidebored.io, Inc.
Category
Email Sending Services
Our grade
1.8 GPA, weak

The report card

Best for SMTP sending for developers on Heroku or anywhere

Mailer To Go sends transactional email over SMTP, from $15 a month for 25,000 emails. There is no free plan, and the REST API is still listed as in development.

ToolGPA report cardMailer To GoGraded Nov 13, 2026
SubjectGradeComment
Value for moneyCStarter 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.
Free plan and trialFNothing free: there is no free plan or trial, so every plan is paid from day one.
FeaturesCSMTP sending, delegated DNS, suppression handling, delivery webhooks and inbound routing. The REST API is still in development, so sending today is SMTP only.
Ease of useCNo store rating on record. It takes sending domains and DNS to set up, but it is a plain SMTP service.
Platforms and integrationsBWeb, SMTP, and Heroku, Addons.io and Build.io add-ons, plus Rails, Django, Laravel and Nodemailer guides. No apps.
Grade point averageWeak, out of 4.01.8

An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.

Who Mailer To Go is for

  • 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

Who it is not for

  • 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

Good to know

Good for

  • Developers on Heroku who want a managed sender as an add-on
  • Apps whose mailer already speaks SMTP
  • Teams that want volume-based pricing without per-contact fees

Worth knowing

  • 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.

Part 02 · Pricing

What it costs

Every plan, the free plan, ways to pay less and how prices have moved

$15

A month to start

Mailer To Go is a paid product, starting at $15 per month for 25,000 emails.

Nothing free: there is no free plan or trial, so every plan is paid from day one.
From our grade for free plan and trial

  • 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.

Read from mailertogo.com on Nov 13, 2026.

Ways to pay less

  • Annual discount

    20% off with annual billing

    The plans page says annual billing saves 20% on the direct plans.

    Stated on mailertogo.com

Part 03 · Features

What it does

Its main features, where it runs, what it works with and who makes it

1

Place it runs: Web

Managed SMTP sending for developers and Heroku apps. Here is what it does, as its own site describes it, and what it covers: public API, transactional email.

SMTP sending, delegated DNS, suppression handling, delivery webhooks and inbound routing.
From our grade for features
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.

Where it runs

  • Web

What it works with

  • Heroku
  • Addons.io
  • Build.io
  • Rails
  • Django
  • Laravel
  • Nodemailer

Mailer To Go is made by Sidebored.io, Inc.

Part 04 · Standing

Where it stands

Its grades against its category, and whether to keep it or make your own

4/50

Other email sending services it is graded above

Mailer To Go's GPA of 1.8 is higher than 4 of the 50 other email sending services we grade, and level with 4.

It stands best on platforms and integrations (B, above 17 of 50) and worst on free plan and trial (F, above 0).

Its paid plans start at $15 a month, against a middle price of $15 for the category: 19 of the 41 others that charge start lower.

On features, ease of use and platforms it scores 2.3 out of 4. 7 tools score higher and cost less.

Each grade against the category

Every bar is all 51 email sending services we grade, cut by the letter each got. Mailer To Go’s own letter is outlined.

  • CValue for moneyAbove 8 of 50
  • FFree plan and trialAbove 0 of 50
  • CFeaturesAbove 0 of 50
  • CEase of useAbove 7 of 50
  • BPlatforms and integrationsAbove 17 of 50

Price against what you get

Each dot is one of 44 email sending services. Further left costs less; higher up scores better on features, ease of use and platforms. Mailer To Go is the marked dot.

D1.0C2.0B3.0A4.0Free$1$2$5$10$20$50$100$200$500$1kMore for lessCosts more, scores moreCosts less, scores lessCosts more, scores lessMailer To GoFluentSMTPResendMailjetHyvor RelayEmailEngine

What paid plans start at, a month (each step along is roughly double) →

Keep it, or make your own?

Whether this is something you could build for yourself with an AI app builder, and what you would give up.

Keep it

To replace Mailer To Go you would be making mail servers with a good name among inbox providers. That is not a weekend's work, with an AI app builder or without one.

That makes this kind of software worth paying for, not this one in particular: 42 of the 50 other email sending services grade higher. It costs $180 a year.

What you could not

  • Mail servers with a good name among inbox providers.
  • It plugs into other products, Heroku, Addons.io and Build.io among them, and has an API.

What this rests on. Mailer To Go’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.

Part 05 · Alternatives

The alternatives

The tools it is most often weighed against, side by side

Mailgun, Twilio SendGrid, Postmark, Amazon SES and SMTP2GO

The 5 tools Mailer To Go is most often weighed against, with where each one differs from it.

Part 06 · Questions

Quick answers

The questions people ask about it, each answered in a line or two

14

Questions, each answered in a line or two

The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.

Is Mailer To Go free?

No. Mailer To Go is a paid product, starting at $15 per month for 25,000 emails.

How much does Mailer To Go cost?

Mailer To Go lists 3 plans. Starter: $15 per month for up to 25,000 emails, billed monthly.

What platforms does Mailer To Go work on?

Mailer To Go is available on Web.

Does Mailer To Go offer any discounts?

Mailer To Go publicly lists the following: 20% off with annual billing.

Does Mailer To Go have an Android app?

No Android app was listed when its pages were read on Nov 13, 2026. Mailer To Go is listed for Web.

Does Mailer To Go have an iPhone app?

No iPhone app was listed when its pages were read on Nov 13, 2026. Mailer To Go is listed for Web.

Is Mailer To Go open source?

Mailer To Go is not described as open source on its own site, as read on Nov 13, 2026.

Does Mailer To Go have an API?

Yes. Mailer To Go offers a public API, according to its own site.

What does Mailer To Go integrate with?

Mailer To Go's listing names Heroku, Addons.io, Build.io, Rails, Django, Laravel and Nodemailer.

Who makes Mailer To Go?

Mailer To Go is made by Sidebored.io, Inc.

What are the alternatives to Mailer To Go?

The closest alternatives to Mailer To Go in our directory are Mailgun, Twilio SendGrid, Postmark, Amazon SES and SMTP2GO.

How does Mailer To Go compare with other email sending services?

Mailer To Go's GPA of 1.8 is higher than 4 of the 50 other email sending services we grade, and level with 4.

Is Mailer To Go good value for money?

ToolGPA grades Mailer To Go C for value for money. Its paid plans start at $15 a month, against a middle price of $15 for the category: 19 of the 41 others that charge start lower.

Could I make my own version of Mailer To Go?

To replace Mailer To Go you would be making mail servers with a good name among inbox providers.

Where this guide comes from

The prices, plans, platforms and features were read from Mailer To Go’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from Mailer To Go's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.

Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Sidebored.io, Inc. Prices change, so check mailertogo.com before you buy.

Part 07 · About

About ToolGPA

Who made this guide, what else is on the site, and how to cite it

7,721

Tools graded, in 95 categories

ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.

Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.

  • 7,721

    tools graded

  • 95

    categories

  • 739

    price changes on record

  • 579

    apps priced in 12 countries

What else is on toolgpa.com

Scan for the live page

Prices and grades as they are today

Quoting this guide?

Please name ToolGPA and link to the live page, so readers can check the figures for themselves:

ToolGPA, "Mailer To Go: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/mailer-to-go

Know someone choosing between email sending services?

Send them this guide: toolgpa.com/tools/mailer-to-go/guide

ToolGPA elsewhere: youtube.com/@toolgpa

See our other guides

The best-graded email sending services after Mailer To Go, each with an Insider's Guide of its own.

ToolGPA

Choosing software? Every tool graded, every price dated.

Compare tools at toolgpa.com ›

Everything in this guide is ToolGPA’s own summary of what Mailer To Go’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Mailer To Go is a trademark of its owner, and this guide is not made, paid for or approved by Sidebored.io, Inc. Prices and plans change: check mailertogo.com before you buy.