AuthSMTP vs Mailjet (2026): which should you pick?
As of Nov 13, 2026, we pick Mailjet: it is third in our ranking of email sending services, and it grades higher too, 2.4 against 1.8.
Checked Oct 18, 2026 and Nov 12, 2026 · graded Oct 18, 2026 and Nov 12, 2026 by ToolGPA
AuthSMTP grades higher on value for money. Mailjet grades higher on the free plan, features and platforms. They get the same grade on ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Mailjet
Email API, SMTP relay and campaign editor on one plan priced by volume
Which one is for you
Pick AuthSMTP if
- Fits if you want to send from your own domain through SMTP and need nothing else
- Works for older apps and devices that can only send through SMTP
Look elsewhere if
- Not for you if you want to try it free, because there is no free plan or trial
- Skip it if you want a campaign builder or marketing tools, as it is an SMTP relay only
- Watch out: pricing is by the year only, charged up front
- Watch out: the 14-day money-back guarantee covers only new card or PayPal accounts and ends after 100 messages
- Tight if you send big files: data allowances assume an average message of 300 KB
Pick Mailjet if
- Fits if you want receipts and newsletters sent from one account on one plan
- Works for teams whose email data has to stay in the EU
Look elsewhere if
- Pricey if you only send app email, as you pay for campaign tools you won't touch
- Tight if you pass 50,000 emails a month, where Essential stops and Premium is $59, or $499 at 500,000
- Not for you if you need a dedicated IP below 100,000 emails a month, and even then it's on request
- Watch out: the free plan stops at 200 emails a day and has online support for the first month only
- Skip it if you need automations or landing pages on Essential, as they start with Premium
How we grade them
| 1.8GPAAuthSMTPWeak | 2.4GPAMailjetFair | |
|---|---|---|
| Value for money | B$72 a year for 2,000 emails a month works out to $6 a month, inside the cheapest quarter of email sending tools. It is billed yearly, and 10,000 emails a month is $216 a year. | CGraded on 50,000 emails a month: Essential is $40 at that volume billed monthly, 10% less paid yearly, toward the dear end of this category. The same plan covers campaigns, with unlimited contacts and segments, but 50,000 is as far as Essential goes. |
| Free plan and trial | FNo free plan and no trial. A 14-day money-back guarantee is not a trial, and it ends after 100 messages sent or an upgrade. | CFree for good, no card: 6,000 emails a month with the API, SMTP and webhooks, the largest monthly allowance of any free plan here. It's capped at 200 a day, and online support only lasts the first month. |
| Features | CIt does one job: authenticated SMTP sending, with several from addresses, a control panel, logs and scanning. It is a smaller job, and it does that job fully. | BAPI and SMTP sending, a parse API for inbound email, webhooks, templates with variables, a campaign editor with MJML, validation and inbox previews. It covers the sending job; automations and landing pages need Premium. |
| Ease of use | CA web control panel with no rating on record. You enter SMTP credentials into whatever sends your mail. | CJudged on how fast a developer sends a first email: API keys and SMTP details come with the free plan, once your domain is set up. No rating on record. The campaign side adds an editor and lists to learn, if you use it. |
| Platforms and integrations | CWeb control panel only, with no integrations listed on the pages read. | BWeb, with an API and SMTP relay, plus WordPress, WooCommerce, Shopify, HubSpot, Google Cloud and Sinch Engage. No desktop or phone app, so B is the top. |
| Best for | sending from an app or device through SMTP | app email and newsletters on one plan |
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: AuthSMTP and Mailjet. How we grade
Price against what you get
AuthSMTP starts at $6 a month when paid by the year and scores 2.0 out of 4 on features, ease of use and platforms. Mailjet starts at $8.10 a month and scores 2.7.
Mailjet scores higher, and starts $2.10 a month higher: the question is whether the extra is worth that to you. Of the other email sending services on the chart, 2 score higher than AuthSMTP for less, and none scores higher than Mailjet 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
- Mailjet also covers marketing automation, email campaigns and email verification.
At a glance
| AuthSMTP | Mailjet | |
|---|---|---|
| Pricing | Paid | Free plan |
| Starts at | $72 per year for 2,000 emails a month | $8.10 per month for 8,000 emails, billed annually ($9 billed monthly) |
| Free plan | None | 6,000 emails a month, limited to 200 a day, 1,000 contacts, the API, SMTP relay, webhooks and the email editor. No credit card needed. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | GetOnline Ltd | Mailjet |
| Price read from | authsmtp.com | mailjet.com |
| Checked | Nov 12, 2026 | Oct 18, 2026 |
Worth knowing
AuthSMTP
- Pricing is by the year only, and no free plan or trial is offered.
- The 14-day money-back guarantee ends after 14 days, after 100 messages sent or after an upgrade, and covers new card or PayPal accounts only.
- It is an SMTP relay without a campaign builder or marketing tools.
- Data allowances are calculated on an average message size of 300 KB, which the pricing page lets you change.
Mailjet
- There are no separate sending-only plans: the same plans cover API sending and marketing campaigns, with marketing features unlocked by tier.
- The free plan caps sending at 200 emails a day and offers online support only in the first month.
- Essential tops out at 50,000 emails a month; higher volumes need Premium, which is $499 a month at 500,000.
- A dedicated IP is available on Premium only from the 100,000-email plan, on request.
Key features
AuthSMTP
- Authenticated SMTP
- Sends from any application through an authenticated SMTP server, with SSL or TLS, alternative ports and multiple concurrent connections.
- Multiple from addresses and domains
- Each account allows a set number of from addresses or domains, from 20 on the smallest to 600 on the larger accounts.
- Flexible quota upgrades
- The site says an account can be boosted in a month as usage grows, with no automatic payments.
- Control panel and logs
- An online control panel shows account status and logged errors. A separate REST API is described, with message submission in beta.
- Security and scanning
- Messages are virus-scanned, with sender-domain validation and SPF and DKIM support. The site says it maintains PCI DSS compliance.
Mailjet
- Send API and SMTP relay
- Send password resets, receipts and other app email through a REST API or SMTP relay, with templates that take per-recipient variables.
- Parse API for inbound email
- Turns incoming emails into data your app can act on, alongside real-time webhooks for deliveries, opens, clicks and bounces.
- Campaign editor and MJML
- A drag-and-drop editor with templates for newsletters, plus MJML, a markup language for coding responsive emails.
- Automations and landing pages
- Premium adds automated email workflows, landing pages, A/B testing and advanced statistics.
- Email validation and previews
- Essential includes 500 address validations and 500 inbox previews a month; Premium raises previews to 2,000.
- EU data and GDPR
- EU-based data centers, ISO 27001-certified infrastructure and tracking-consent settings aimed at European privacy rules.
Plans
AuthSMTP
AuthSMTP 2$72
per year for 2,000 emails a month
20 from addresses or domains, 600 MB of data a month, shared IP address.
AuthSMTP 4$108
per year for 4,000 emails a month
40 from addresses or domains, 1.2 GB of data a month, shared IP address.
AuthSMTP 10$216
per year for 10,000 emails a month
100 from addresses or domains and 3 GB of data a month. Steps of 6, 8 and 15 sit between the larger ones.
AuthSMTP 20$336
per year for 20,000 emails a month
200 from addresses or domains and 6 GB of data a month.
AuthSMTP 50$450
per year for 50,000 emails a month
500 from addresses or domains and 15 GB of data a month; the table marks a dedicated IP as available from this size.
AuthSMTP 100$870
per year for 100,000 emails a month
600 from addresses or domains and 30 GB of data a month. Larger accounts continue past 1 million a month.
Mailjet
Free$0
6,000 emails a month and 200 a day, 1,000 contacts, API, SMTP relay, webhooks, basic statistics; online support in the first month only.
Starter$8.10
per month for 8,000 emails, billed annually ($9 billed monthly)
No daily limit, 2,000 contacts, brand kit, 1 subaccount and online support.
Essential$17.10
per month for 15,000 emails, billed annually ($19 billed monthly)
Unlimited contacts, segmentation, AI writing help, 500 address validations, no Mailjet logo. $40 a month at 50,000 emails, billed monthly.
Premium$26.10
per month for 15,000 emails, billed annually ($29 billed monthly)
Automations, landing pages, advanced stats, priority support, up to 20 subaccounts. $59 a month at 50,000 emails; dedicated IP from 100,000.
CustomCustom
For high-volume senders: a technical account manager, dedicated IP strategy, blocklist monitoring and deliverability reports.
Ways to pay less
AuthSMTP
No public discounts listed.
Mailjet
- Annual discount
10% off with annual payment
Paying yearly takes 10% off: Starter is $8.10 a month instead of $9, Essential $17.10 instead of $19 and Premium $26.10 instead of $29.
Common questions
Which is cheaper, AuthSMTP or Mailjet?
As of Nov 12, 2026, AuthSMTP is cheaper to start with: $6 a month when paid by the year, against $8.10 a month for Mailjet. AuthSMTP starts at $72 per year for 2,000 emails a month, and Mailjet starts at $8.10 per month for 8,000 emails, billed annually ($9 billed monthly).
Which has a free plan, AuthSMTP or Mailjet?
As of Nov 12, 2026, only Mailjet has a free plan. AuthSMTP 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.