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SimpleLogin OSS
AGPL-3.0Self-host SimpleLogin OSS for full control over email aliases, PGP forwarding, and custom domains as an open-source alternative to SimpleLogin Premium.
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Overview
Engineering teams testing webhook workflows and isolating staging alerts often need hundreds of throwaway inboxes routed to existing team mailboxes. SimpleLogin OSS runs that forwarding infrastructure directly on private servers through Postfix and containerized Python services. The platform assigns aliases programmatically, shields origin inboxes, and forwards inbound messages with automated PGP encryption.
Why SimpleLogin OSS instead of SimpleLogin Premium
SimpleLogin Premium runs as a managed service on Proton infrastructure in Switzerland, handling server operations, reputation monitoring, and mailbox scaling for a monthly fee. SimpleLogin OSS packages the same application code for private deployment, letting engineers run unlimited custom domains, mailboxes, and aliases on their own hardware. For teams with strict compliance boundaries or high-volume alias requirements across staging environments, self-hosting eliminates third-party message inspection and recurring subscription costs.
The trade-off centers on operational effort and mail deliverability. SimpleLogin Premium guarantees clean IP reputation and turnkey delivery across major providers like Gmail and Outlook. Running SimpleLogin OSS requires configuring Postfix, provisioning DKIM keys, maintaining SPF and DMARC records, and managing server reputation directly. For developers already maintaining Linux servers who want direct API access to their aliasing pipeline, the self-hosted edition integrates cleanly into private infrastructure.
What it does well
- Programmatic alias generation: Developers can automate disposable address creation and deletion through REST API tokens inside CI pipelines and test suites.
- Native Postfix integration: Connects host-level Postfix SMTP processing to containerized Python workers using PostgreSQL tables for dynamic relay lookups.
- Automated PGP encryption: Inbound messages delivered to aliases can be encrypted with the recipient's public PGP key before re-routing to destination mailboxes.
- Bidirectional reverse aliasing: Generates reverse addresses so team members reply directly from standard email clients without revealing original addresses.
- Reconfigurable client applications: Official browser extensions and mobile apps support overriding default cloud endpoints to connect to a private instance.
- Unlimited custom domains: Supports multiple custom domains and catch-all routing without commercial plan tier limits.
