Best Mail Servers in 2025

ZEST provides simple, secure, fully manages servers with email, VPN and file transfer servers.

Key z3.st features:

Privacy Focused Budget Email Server File Transfer Fast VPN

paid Free Trial $10.9 / Monthly (Essential Server)

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder. .

Key MailReach.co features:

Deliverability Improving Email Warming Meaningful Warming Content Smart Warming Algorithm

Visit website paid $19.5 / Monthly (Pro)

Secure email with absolutely no compromises. Get your free encrypted email account today.

Key ProtonMail features:

End-to-End Encryption Zero Access to User Data Swiss Privacy Laws Open Source

freemium €5.0 / Monthly (user - 5 GB)

Deploy your own unlimited SMTP server in one bash command. Self-hosted, secure, and built for email marketing.

Key SMTP-Builder.com features:

Unlimited SMTP Server Trusted Email Sender High Sending Score Full Mail Server

paid $3.99 (1 SMTP Builder Credits)

Modernize your mail server.

Key Stalwart Labs features:

Innovative Technology Experienced Team Comprehensive Solutions

Open Source free

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Key Mail-in-a-box features:

Ease of Setup Full Control Cost-effective Open Source

Open Source

An open source mailserver suite.

Key mailcow features:

Comprehensive Feature Set Open Source Docker-based Deployment Active Community and Support

Open Source

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

Key Postfix features:

Security Performance Compatibility Reliability

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

Key Google Workspace features:

Integrations Collaboration Cloud Storage Security

Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.

Key Amazon SES features:

Cost-Effective Scalable High Deliverability Integration with AWS Services

Open Source

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

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Key Zimbra features:

Open Source Cost-Effective Scalability Feature-Rich

Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.

Key Brevo features:

User-Friendly Interface Comprehensive Analytics Customization Options Automation Features

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