Auth-Email - 2026 Pricing, Features, Reviews & Alternatives

Auth-Email is an OAuth relay service that enables legacy applications, hardware devices, and scripts to connect to modern email providers through standard IMAP, POP, and SMTP protocols without native OAuth support. It addresses authentication challenges that occur when providers require OAuth for enhanced security and legacy systems rely on traditional username and password methods. The platform operates as a transparent proxy that handles OAuth authentication on behalf of connected systems while preserving interoperability with existing infrastructure. Full protocol compatibility extends support to all authorization methods and legacy connection protocols for older mail systems.

Users authorize email accounts via a centralized management dashboard using secure OAuth two point zero flows and define custom passwords for application connectivity. A suite of add-ins enables custom mail server behaviors that align with specific business requirements. The service accommodates email aliases, shared accounts, and delegated mailboxes. All account credentials are encrypted with user-defined passwords and remain inaccessible to the service provider.

The dashboard allows administrators to monitor and manage multiple accounts concurrently and to revoke access at any time for compliance purposes. Unlike SMTP forwarding services, Auth-Email maintains connections through the original provider servers to prevent deliverability interruptions and to eliminate the need for complex DNS configuration, SPF, DKIM, or DMARC setup. Server maintenance and mailbox migration are not required.

The platform supports major email providers including Gmail, Google Workspace, Microsoft three hundred sixty five, Exchange Online, Outlook, Windows Live Mail, Hotmail, Yahoo, AOL, Yandex, Fastmail, and Internet service provider accounts from AT and T, Cox, Comcast, Sky, and Rogers. Custom OAuth client configuration is available for all grant types to support specialized authentication scenarios and integration into custom workflows. A range of supplementary tools is provided without registration, including an email header analyzer, connection testing utilities for IMAP, POP, and SMTP, file importers and viewers for EML and MSG formats, a MIME structure explorer, a winmail dot dat opener, DNS record checkers, and tenant management utilities.