Software Alternatives, Accelerators & Startups

AuthSMTP

AuthSMTP is the outgoing SMTP email service for e-commerce websites, mailing lists or email applications.

Some of the top features or benefits of AuthSMTP are: Reliability, Security, Deliverability, Ease of Use, and Support. You can visit the info page to learn more.

Best AuthSMTP Alternatives & Competitors in 2025

The best AuthSMTP alternatives based on verified products, community votes, reviews and other factors.
Filter: 10 Open-Source Alternatives. Latest update:

  1. 18

    turboSMTP is a reliable, powerful, easy-to-use SMTP server that maximizes the deliverability of all...

    Key turboSMTP features:

    Ease of Use Reliability Customer Support Analytics and Reporting

    /turbosmtp-alternatives
  2. 15

    SMTP provides scalable affordable email infrastructure for all your sending needs.

    Key SMTP features:

    Reliability Scalability Analytics Integration

    /smtp-alternatives
  3. Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.

    Key Warmup Inbox features:

    Automatically warms up domain to be ready for cold email Improve Email Deliverability Improve Domain Reputation Improve IP Reputation

    Try for free paid Free Trial $12.0 / Monthly (Per inbox, per month.)

    Try for free
  4. 17

    SMTP2GO is the scalable, reliable email deliverability solution. Worldwide servers, a robust API, and powerful reporting set us apart. Try our free plan!

    Key SMTP2GO features:

    Reliability Global Infrastructure Detailed Reporting Easy Integration

    /smtp2go-alternatives
  5. 12

    WP Mail SMTP is an online platform that facilitates users with multiple facilitation.

    Key WP Mail SMTP features:

    Improved Email Deliverability Easy Configuration Broad Integration Email Logs

    /wp-mail-smtp-alternatives
  6. 14

    EmailSuccess is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements.

    Key EmailSuccess features:

    Scalability Deliverability Advanced Analytics Integration Capabilities

    /emailsuccess-alternatives
  7. 10

    Google's encompassing suite of cloud-based business apps.

    Key Google Workspace features:

    Integrations Collaboration Cloud Storage Security

    /google-workspace-alternatives
  8. Jira Service Management is an online development platform that facilitates users with multiple services.

    Key Jira Service Management features:

    Integration with Atlassian Suite Customizable Workflows Automation Capabilities Scalability

    /jira-service-management-alternatives
  9. Learn why more developers choose SendGrid for their email deliverability service to send transactional emails triggered by web apps. Get started for free.

    Key SendGrid features:

    Scalability API Integration Deliverability Analytics

    /sendgrid-alternatives
  10. 10

    Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.

    Key Postmark features:

    High Delivery Rates Fast Sending Speed User-Friendly Interface Detailed Analytics

    Open Source

    /postmark-alternatives
  11. CritSend is a SMTP relay for developers.

    /critsend-alternatives
  12. 11

    Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

    Key Mandrill features:

    Scalability Deliverability Integration Analytics

    /mandrill-alternatives
  13. Email Validation & Email Verification reduces bounce rates up to 98%. Rapidly verifying email addresses has never been easier, just drag drop and deliver!

    Key BriteVerify features:

    Accuracy Speed Ease of Use API Integration

    /briteverify-alternatives
  14. Marketing & transactional email delivery platform.

    Key SocketLabs features:

    Deliverability Scalability User-friendly Interface Analytics and Reporting

    /socketlabs-alternatives
Suggest an alternative
If you think we've missed something, please suggest an alternative to AuthSMTP.

AuthSMTP discussion

Log in or Post with