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turboSMTP

turbosmtp.com

From €14.95/mo Free plan WebWindowsmacOSLinuxiOSAndroid
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Spec score 9.1 #3 of 41 in Transactional email services

What it is

turboSMTP is a cloud SMTP service for sending email messages and newsletters, with statistical analysis for individual and aggregate messages. Its SMTP API supports transactional messages such as login confirmations, welcome messages, and receipts from a website or app. The dashboard tracks clicks and opens in real time, while listed tools manage bounces, spam, and unsubscribes. Deliverability features include smart routing, custom tracking domains, and email validation before campaigns. An email marketing tool can design, send, and track campaigns using turboSMTP delivery infrastructure. The service lists SMTP relay, email templates, delivery event webhooks, and a dedicated IP option; inbound email is not supported. It offers a free plan allowing 200 emails per day for the first six months. Basic costs €14.95 a month for 15,000 emails per month; Pro costs €79.95 a month for the same send limit and up to 100 subaccounts. Other listed plans sell email credits, which expire one year after purchase. Platforms include Android, API, iOS, and web. The maker advertises 24/7 multilingual support by phone, chat, and email.

Spec sheet

What it does
turboSMTP provides hosted SMTP relay and API infrastructure for transactional, marketing and newsletter email delivery.Read 14 Oct 2026 · turbosmtp.com
Product
turboSMTP is a cloud SMTP service for sending email messages and newsletters, with statistical analysis for individual and aggregate messages.Read 5 Oct 2026 · turbosmtp.com
Audience
The company says its service serves needs from home and small businesses to large email providers.Read 5 Oct 2026 · turbosmtp.com
Free plan
NoRead 20 Sep 2026 · turbosmtp.com
Integrations
A Zapier app launched with Send Email and Find Email Status actions for connecting CRMs, forms, spreadsheets and other Zapier applications.Read 14 Oct 2026 · serversmtp.com
Security
Pricing lists SPF/DKIM authentication, API keys, custom sending domains with SPF/DKIM/DMARC, and two-factor authentication as security and compliance features.Read 5 Oct 2026 · turbosmtp.com
Privacy
The maker's GDPR information says users can update, manage, export, and delete their information and describes its data handling and storage practices.Read 5 Oct 2026 · turbosmtp.com
Support
The company states that ticket, live-chat and phone support are available around the clock and handled by human staff.Read 14 Oct 2026 · serversmtp.com
Founded
2009Read 28 Sep 2026 · turbosmtp.com
Anti-spam controls
The anti-spam policy prohibits harvested addresses and allows suspension when customer traffic causes major blacklist or abuse problems.Read 14 Oct 2026 · turbosmtp.com
API authentication
API keys are used for account operations, while consumer-key and consumer-secret credentials are required for the mail-send endpoint.Read 14 Oct 2026 · serversmtp.com
API format
API request and response bodies use JSON in most documented operations.Read 14 Oct 2026 · serversmtp.com
API key lifetime
The normal authorization key expires after two hours unless a non-expiring option is requested; consumer keys remain valid until revoked.Read 14 Oct 2026 · serversmtp.com
API regions
The API documents separate global and European sending hosts, with the EU host dedicated to mail sending.Read 14 Oct 2026 · serversmtp.com
API security change
On April 15, 2025, turboSMTP made consumer API-key authentication mandatory for new SMTP integrations and deprecated use of the master account password.Read 14 Oct 2026 · serversmtp.com
App availability
The turboExecutive companion app is documented as available for Windows, macOS, Linux, iOS and Android, with tracking of delivery, opens and clicks for individual emails.Read 14 Oct 2026 · serversmtp.com
Authentication features
Plans include SPF and DKIM authentication, while the comparison table also lists custom sending domains with DMARC support.Read 14 Oct 2026 · turbosmtp.com
Company founded
The company says turboSMTP was founded in 2009.Read 14 Oct 2026 · turbosmtp.com
Company headquarters
The About page lists Via Palmanova 24, 20132 Milan, Italy, and a second address in Fonni, Sardinia.Read 14 Oct 2026 · turbosmtp.com
Company legal entity
The About page identifies Edisplay srl as the company behind turboSMTP.Read 14 Oct 2026 · turbosmtp.com
Company size
LinkedIn lists turboSMTP as an 11–50 employee partnership headquartered in Milan.Read 14 Oct 2026 · linkedin.com
Dedicated IP option
YesRead 20 Sep 2026 · turbosmtp.com
Deliverability tools
The service includes suppression management, deliverability optimization, dedicated-IP options and Smart Routing across shared IPs.Read 14 Oct 2026 · turbosmtp.com
Developer support
The SMTP API documentation lists sample source code in PHP, C#, Java, Python, Perl, and Ruby.Read 5 Oct 2026 · turbosmtp.com
Email validation
Its validation tool checks uploaded addresses and classifies them into statuses including valid, invalid, catch-all, spamtrap, abuse, do-not-mail and unknown.Read 14 Oct 2026 · serversmtp.com
Licence
The public API document is marked MIT, while the hosted turboSMTP service itself is commercial and proprietary.Read 14 Oct 2026 · serversmtp.com
Limit: account reviews and blocking
Trustpilot complaints describe sending being paused or accounts blocked during abuse reviews, sometimes with slow communication or unresolved refund requests.Read 14 Oct 2026 · uk.trustpilot.com
Limit: API and scale
G2 feedback mentions weak spreadsheet-oriented API workflows, restrictive volume limits and a need for stronger enterprise automation and analytics.Read 14 Oct 2026 · g2.com
Limit: bounce handling
A Trustpilot reviewer reported false invalid-recipient bounces, automatic blocking of addresses and no proactive notification mechanism.Read 14 Oct 2026 · uk.trustpilot.com
Limit: entry pricing
A G2 reviewer requested a lower-volume paid tier for testing instead of starting at the existing paid thresholds.Read 14 Oct 2026 · g2.com
Mail-client compatibility
The service documents configuration for common clients including Outlook, Thunderbird and Apple Mail.Read 14 Oct 2026 · turbosmtp.com
Marketing campaigns
The dashboard includes an email marketing tool for designing, sending, and tracking campaigns using turboSMTP delivery infrastructure.Read 5 Oct 2026 · serversmtp.com
Monthly send limit
15000Read 20 Sep 2026 · turbosmtp.com
Notable outage
A May 7, 2026 incident report says a fire at the NorthC Almere data centre caused a major outage and multi-day degradation; core sending was restored within 48 hours from Frankfurt failover infrastructure.Read 14 Oct 2026 · serversmtp.com
Plan limits
The pricing page states free plan allowance as 200 emails per day, while its validity is listed as the first six months.Read 5 Oct 2026 · turbosmtp.com
Praise: deliverability
G2 reviewers commonly praise inbox delivery, reduced bounces and reliable transactional or marketing sending.Read 14 Oct 2026 · g2.com
Praise: human assistance
Trustpilot reviewers frequently praise responsive human support, quick troubleshooting and help with setup or renewals.Read 14 Oct 2026 · trustpilot.com
Praise: support and setup
G2 reviewers repeatedly describe setup as easy and support as fast, knowledgeable and provided by real people.Read 14 Oct 2026 · g2.com
Rating on Capterra
0.0 out of 5 from 0 reviews.Read 14 Oct 2026 · capterra.com
Rating on G2
4.0 out of 5 from 23 reviews.Read 14 Oct 2026 · g2.com
Rating on Trustpilot
4.2 out of 5 from 670 reviews.Read 14 Oct 2026 · uk.trustpilot.com
REST API
The public API is version 2 and exposes mail, authentication, suppressions, billing, validation, subaccount, alert, analytics and key-management endpoints.Read 14 Oct 2026 · serversmtp.com
SDKs
Official C# and PHP SDKs are published as open-source libraries and cover sending, relay statistics, suppressions and email validation.Read 14 Oct 2026 · serversmtp.com
Security and privacy
Official pages state GDPR compliance, EU data-retention practices, encrypted transmission and support for consent and deletion requests.Read 14 Oct 2026 · turbosmtp.com
Self-hosting
The documentation describes hosted API and SMTP endpoints and provides no self-hosted deployment package.Read 14 Oct 2026 · serversmtp.com
SMTP relay
The service offers authenticated SMTP relay connections for sending application and campaign email.Read 14 Oct 2026 · turbosmtp.com
Subaccounts
Pro plans support up to 100 subaccounts, while Enterprise offers unlimited subaccounts.Read 14 Oct 2026 · turbosmtp.com
Tracking
The platform provides real-time delivery, open and click reporting and supports custom tracking domains.Read 14 Oct 2026 · turbosmtp.com
Transactional email
Its SMTP API supports sending transactional messages such as login confirmations, welcome messages, and receipts from a website or app.Read 5 Oct 2026 · turbosmtp.com
Use restrictions
The anti-spam policy prohibits unsolicited email and requires mass campaigns to explain list signup, include an unsubscribe mechanism, and provide the sender's postal address.Read 5 Oct 2026 · turbosmtp.com
Webhooks
HTTPS webhooks report delivery events such as delivered, deferred, bounced and dropped, plus opens, clicks, unsubscribes and spam reports.Read 14 Oct 2026 · serversmtp.com
WordPress integration
The official WordPress plugin integrates with wp_mail and exposes delivery analytics in the WordPress administration area.Read 14 Oct 2026 · serversmtp.com

Plans and prices

Free Free Valid for first 6 months 200 emails/day Read 20 Sep 2026 · turbosmtp.com
Basic €14.95 a month billed monthly 15,000 emails/mo Read 20 Sep 2026 · turbosmtp.com
Pro €79.95 a month billed monthly 15,000 emails/mo · Up to 100 subaccounts Read 20 Sep 2026 · turbosmtp.com
Silver €49 a month Unused credits expire one year after purchase 50,000 emails Read 20 Sep 2026 · turbosmtp.com
Gold €92 a month Unused credits expire one year after purchase 100,000 emails Read 20 Sep 2026 · turbosmtp.com
Resell €270 a month Unused credits expire one year after purchase 300,000 emails Read 20 Sep 2026 · turbosmtp.com
Titanium €450 a month Unused credits expire one year after purchase 500,000 emails Read 20 Sep 2026 · turbosmtp.com
Diamond €790 a month Unused credits expire one year after purchase 1,000,000 emails Read 20 Sep 2026 · turbosmtp.com
FREE Free €0/ month; valid for first 6 months 200 emails/day · SMTP Relay and Web API · SPF/DKIM authentication Read 14 Oct 2026 · turbosmtp.com
BASIC €14.95 a month €14.95/ month, billed monthly Up to 15,000 emails/month · SMTP Relay and Web API · SPF/DKIM authentication · one subaccount Read 14 Oct 2026 · turbosmtp.com
Silver €49, paid once €49 one-time prepaid 50,000 emails · credits expire after one year · Basic-plan features Read 14 Oct 2026 · turbosmtp.com
PRO €79.95 a month €79.95/ month, billed monthly Up to 15,000 emails/month at the displayed slider setting · dedicated IP and custom routing · 365-day analytics · up to 100 subaccounts · priority support Read 14 Oct 2026 · turbosmtp.com

Every turboSMTP plan and price →

Strong points and limits

Strong points

  • SMTP API supports transactional messages
  • Real-time click and open tracking
  • Includes bounce, spam, and unsubscribe management
  • Offers custom tracking domains and email validation
  • 24/7 multilingual phone, chat, and email support

Limits

  • Free plan lasts only the first six months
  • Inbound email is not supported
  • Unsolicited email is prohibited
  • Unused email credits expire after one year

Who it suits

turboSMTP suits website and app operators sending transactional email, as well as teams running newsletters or campaigns. Its listed API examples span several programming languages, and the maker also provides a WordPress SMTP plugin.

turboSMTP in depth

Read the full write-up

Overview

turboSMTP is a cloud service for sending transactional email and newsletters, with campaign design and tracking in the same dashboard. It is a sensible fit for developers and businesses that want SMTP or API delivery alongside marketing tools, particularly WordPress and WooCommerce users. Its combination of monthly quotas and credit bundles is flexible, but the free plan lasts only six months.

Key features

SMTP relay and an API cover website and app messages such as login confirmations, welcome emails and receipts. Delivery-event webhooks can pass message activity to other workflows, and developers can refer to sample code in PHP, C#, Java, Python, Perl and Ruby. The service handles outbound mail only: inbound email is not supported.

The dashboard also supports campaign design, sending and real-time open and click tracking. Bounce, spam and unsubscribe management, smart routing, custom tracking domains and pre-send email validation give campaign operators tools for monitoring delivery and list quality. These features make it more than a bare relay, but do not remove the need for careful list practices: unsolicited email is prohibited, and mass campaigns must explain how recipients signed up, include an unsubscribe mechanism and show the sender's postal address.

A free WordPress SMTP plugin and compatibility with WPForms, Hostinger and WooCommerce workflows are useful for site operators who want to route existing site mail through the service. Security features include SPF/DKIM authentication, API keys, custom sending domains supporting SPF/DKIM/DMARC, and two-factor authentication. The maker also describes GDPR controls for managing, exporting and deleting user information, and advertises 24/7 multilingual support by phone, chat and email.

Pricing

The Free plan costs 0.00 EUR and allows 200 emails per day, but is valid only for the first six months. It can cover a short evaluation or low-volume start, not a permanent free sending tier.

Basic costs €14.95 a month for 15,000 emails per month. It is the clearest fit for a small sender who needs a recurring quota; the monthly cap is a real constraint for busier campaigns. Pro costs €79.95 a month and keeps the same 15,000-email monthly allowance while adding up to 100 subaccounts. That makes it relevant when account separation matters, but difficult to justify on volume alone.

For credit-based sending, Silver costs €49 a month for 50,000 emails, Gold costs €92 a month for 100,000, Resell costs €270 a month for 300,000, Titanium costs €450 a month for 500,000, and Diamond costs €790 a month for 1,000,000. These bundles suit senders whose needs do not fit the lower monthly quotas, but unused credits expire one year after purchase, so sporadic senders risk paying for volume they do not use. Enterprise supports 1,000,000+ emails with custom pricing.

Platforms

turboSMTP supports web, Android, iOS and API access. That mix covers dashboard use and application integration, while the API and webhooks suit teams building email delivery into their own services.

Who it's for

Choose turboSMTP if you need both transactional sending and campaign tools, or want a WordPress or WooCommerce email workflow backed by SMTP delivery. Its monthly plans suit predictable, modest volumes; credit bundles give higher-volume senders more room. It is a weaker fit for teams that need inbound email, a lasting free plan, or sending without the stated campaign compliance obligations.

Pros and cons

Pros: SMTP, API sending, webhooks and campaign tools share one service, making it practical for teams handling operational messages and newsletters together.

Pros: WordPress plugin and named compatibility with WPForms, Hostinger and WooCommerce simplify adoption for users of those workflows.

Pros: Credit bundles scale to 1,000,000 emails, with Enterprise for 1,000,000+.

Cons: The free plan ends after six months, limiting its usefulness as a long-term low-cost option.

Cons: Unused credit expires after a year, which penalizes senders with irregular volume.

Cons: Inbound email is unavailable, and campaign sending carries explicit consent, unsubscribe and postal-address requirements.

Alternatives

For a broader category comparison, browse Transactional Email Software. Postmark is worth considering if a permanent free allowance matters: its free plan never expires but is capped at 100 emails per month with no overages. MailerSend is another API-oriented option, with a free plan of 500 emails per month and a Hobby plan priced at $5.60 a month.

Mailchimp may suit teams whose needs center on contact-based campaign limits: its free plan allows 250 contacts and 500 emails per month, with one audience and one seat. Twilio SendGrid offers a free trial capped at 100 emails per day for 60 days. Nuntly has a free plan with 3,000 emails per month and a 100-email daily cap. EmailSuccess offers a free plan with 100,000 emails per day and two active IPs. ReachMail has a free plan for fewer than 5,000 contacts and less than 15,000 emails per month. Twilio Segment is another alternative to consider.

Verdict

turboSMTP is a strong choice for teams that want transactional SMTP/API delivery and campaign management under one roof, especially site operators using WordPress or WooCommerce. Its breadth and higher-volume credit bundles are the main reasons to choose it; the temporary free tier, annual credit expiry and lack of inbound email are the reasons to look elsewhere.

Verdict

turboSMTP combines SMTP delivery, campaign tools, and message tracking, with both daily and credit-based plans. Review the free-plan duration and anti-spam requirements before sending campaigns.

Where Specifiction places it

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