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AuthSMTP review

#14 of 26 in SMTP Relay Services

A focused SMTP relay with validated senders, reporting, and annual message-based plans.

7.1/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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.

AuthSMTP pros and cons

  • 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

AuthSMTP fact sheet, pricing and score →

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