AuthSMTP
AuthSMTP: A focused SMTP relay with validated senders, reporting, and annual message-based plans. Ranked #14 of 26 in SMTP Relay Services by our editors (7.1/10); pricing: Paid; best for basic authenticated SMTP users.
At a glance
- Editor score7.1 / 10
- PricingPaid
- Best forBasic authenticated SMTP users
- Free planNo
- Paid from$72/yr
- Monthly send limit2000 emails/mo
- Facts checked21 Sep 2026
Where it wins
- Authenticated SSL/TLS relay with sender validation
- Bounce, complaint, history, and quota reporting
- Shared or dedicated IP address options
Where it doesn't
- No free plan for occasional senders
- Annual billing starts at $72 for 2,000 monthly messages
- No inbound parsing, event webhooks, or subaccounts
Our verdict on AuthSMTP
AuthSMTP is an authenticated outgoing SMTP relay for websites, mailing lists, email applications, and connected devices. It suits individuals, small businesses, e-commerce sites, medium-sized organizations, and web services that need transactional or other outgoing email delivery through a dedicated provider. Connections use SMTP authentication and SSL/TLS, while sender addresses and domains are validated before use. The service is available through web and API access, with an online control panel for account and usage management.
Pricing is organized around annual message quotas. AuthSMTP 2 costs $72 per account per year for 2,000 messages and 600 MB of data per month, with 20 from addresses/domains and a shared IP address. AuthSMTP 4 costs $108 for 4,000 messages and 1.20 GB; AuthSMTP 6 costs $144 for 6,000 messages and 1.80 GB. Higher plans include AuthSMTP 8 at $180 for 8,000 messages, AuthSMTP 10 at $216 for 10,000, AuthSMTP 15 at $276 for 15,000, AuthSMTP 20 at $336 for 20,000, and AuthSMTP 50 at $450 for 50,000 messages per month. Data allowances rise with each plan, reaching 15.00 GB on AuthSMTP 50.
The feature set is practical for basic relay needs: alternative SMTP ports, up to five concurrent connections, bounce and spam complaint reporting, message history, quota monitoring, virus scanning, and email duplication or backup. A REST API provides account and usage data, while shared or dedicated IP options support different delivery requirements; dedicated IP allocation is free but subject to approval. AuthSMTP is a strong fit when straightforward authenticated sending and quota-based pricing matter. Teams needing inbound processing, event-driven webhooks, subaccounts, or a free entry tier should choose a service built around those capabilities instead.
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AuthSMTP pricing
All 12 AuthSMTP plans and prices →
AuthSMTP fact sheet
| Free plan | No |
|---|---|
| Paid from | $72/yr |
| Monthly send limit | 2000 emails/mo |
| Dedicated IP option | Dedicated |
| Inbound email parsing | No |
| Event webhooks | No |
| Subaccounts | No |
| Email log retention | Not verified |
| Money-back guarantee | 14 days |
| Deployment | Cloud |
| Platforms | Web |
| Compliance & security | GDPR, PCI DSS |
| Support | Email, Tickets, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Paid (source) |
| Website | authsmtp.com |
| Facts checked | 21 Sep 2026 |
Alternatives to AuthSMTP
- PostmarkA focused SMTP and API service for transactional email, streams, templates, and events.8.8
- Amazon SESA broad AWS email platform with low usage-based pricing and no permanent free plan.8.7
- MailjetA broad email platform pairing SMTP relay with campaigns, automation, and analytics.8.7
See all AuthSMTP alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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