AuthSMTP vs turboSMTP (2026): which should you pick?
As of Nov 12, 2026, turboSMTP grades higher than AuthSMTP: 2.2 against 1.8 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
AuthSMTP grades higher on value for money. turboSMTP grades higher on the free plan. They get the same grade on features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
turboSMTP
SMTP relay and email API on European infrastructure, with a free plan
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 turboSMTP if
- Fits if you send a few thousand emails a month and want a free plan with no time limit
- Works for agencies that need subaccounts on Pro
Look elsewhere if
- Tight if you need webhooks or a dedicated IP, as both are Pro features
- Pricey if you want a dedicated IP at small volume, since Pro starts at 100,000 emails and $79.95 a month billed monthly
- Watch out: prepaid packages run from $49 for 50,000 emails and their credits expire after one year
- Watch out: listed prices exclude VAT where it applies
- Skip it if you need several sending domains on the free plan, which has 1
How we grade them
| 1.8GPAAuthSMTPWeak | 2.2GPAturboSMTPFair | |
|---|---|---|
| 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. | C$12.46 a month billed annually ($14.95 monthly) for 15,000 emails, between the cheaper quarter ($10) and the dearer quarter ($20). |
| 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. | BUp to 200 emails a day by SMTP and API with SPF and DKIM and no time limit, which a small site can live on, though it allows only 1 sending domain. |
| 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. | CAn SMTP relay and web API, subaccounts, analytics and email validation credits, but webhooks, a dedicated IP and phone support are Pro only. |
| Ease of use | CA web control panel with no rating on record. You enter SMTP credentials into whatever sends your mail. | CNo store rating on record. You verify a sending domain with DNS records and wire up SMTP credentials or an API key before the first email goes out. |
| Platforms and integrations | CWeb control panel only, with no integrations listed on the pages read. | CA web dashboard, SMTP and an API; the listing names no integrations. |
| Best for | sending from an app or device through SMTP | SMTP relay with a free plan and a dedicated-IP step |
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 turboSMTP. 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. turboSMTP starts at $12.46 a month and scores 2.0.
They score the same, and AuthSMTP starts $6.46 a month lower. Of the other email sending services on the chart, 2 score higher than AuthSMTP for less, and 10 score higher than turboSMTP 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
- turboSMTP also covers email verification.
At a glance
| AuthSMTP | turboSMTP | |
|---|---|---|
| Pricing | Paid | Free plan |
| Starts at | $72 per year for 2,000 emails a month | $12.46 per month for 15,000 emails, billed annually ($14.95 monthly) |
| Free plan | None | Up to 200 emails a day by SMTP relay and web API, with SPF and DKIM authentication and chat and ticket support. No time limit. |
| Free trial | None listed | Pro plan free for 1 month |
| Web | ||
| Made by | GetOnline Ltd | Edisplay srl |
| Price read from | authsmtp.com | serversmtp.com |
| Checked | Nov 12, 2026 | Nov 12, 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.
turboSMTP
- A dedicated IP, webhooks and phone support are Pro features; Basic and Free have none of them.
- Pay-as-you-go prepaid packages run from 50,000 emails for $49 to 1,000,000 for $790, and credits expire after one year.
- Listed prices exclude VAT where it applies, and Enterprise is billed the month after on usage.
- Pro starts at 100,000 emails a month, so a small sender wanting a dedicated IP still pays $79.95 monthly.
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.
turboSMTP
- SMTP relay and web API
- Mail can be sent through an SMTP relay or a web API on every plan, with interactive API docs and a setup guide.
- Dedicated IP on Pro
- A dedicated IP and automated IP routing start on Pro, and dedicated IP pools are an add-on there and included on Enterprise.
- Subaccounts
- Pro allows up to 100 subaccounts and Enterprise unlimited, for separating the mail of different customers or projects.
- Analytics and webhooks
- Analytics are kept for 30 days on Basic and 365 days on Pro and Enterprise. Webhooks and unlimited custom tracking domains start on Pro.
- Email validation credits
- Plans include email validation credits: 100 on Free and Basic, 3,000 a month on Pro and 10,000 a month on Enterprise.
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.
turboSMTP
Free$0
Up to 200 emails a day, SMTP relay and API, 1 sending domain and 2 API keys. No dedicated IP.
Basic$12.46
per month for 15,000 emails, billed annually ($14.95 monthly)
30-day analytics, 2 sending domains. Price rises with volume: $24.96 a month yearly at 100,000 emails ($29.95 monthly).
Pro$66.63
per month for 100,000 emails, billed annually ($79.95 monthly)
Dedicated IP, webhooks, 365-day analytics, up to 100 subaccounts and phone support. $416.63 a month yearly at 1,000,000 emails.
EnterpriseCustom
Over 2.5 million emails a month, billed the month after on what you send, with unlimited subaccounts and IP pools.
Ways to pay less
AuthSMTP
No public discounts listed.
turboSMTP
- Annual discount
Two months free on yearly billing
Basic and Pro can be billed yearly at ten times the monthly price, which the page describes as two months free.
Common questions
Which is cheaper, AuthSMTP or turboSMTP?
As of Nov 12, 2026, AuthSMTP is cheaper to start with: $6 a month when paid by the year, against $12.46 a month for turboSMTP. AuthSMTP starts at $72 per year for 2,000 emails a month, and turboSMTP starts at $12.46 per month for 15,000 emails, billed annually ($14.95 monthly).
Which has a free plan, AuthSMTP or turboSMTP?
As of Nov 12, 2026, only turboSMTP 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.