{"id":"rayenmalouche-java-mcp-server-for-smtp-mailing","name":"Java-MCP-Server-For-SMTP-Mailing","homepage":null,"repo_url":"https://github.com/RayenMalouche/Java-MCP-Server-For-SMTP-Mailing","category":"communication","subcategories":[],"tags":["mcp","smtp","email","java","stdio","sse","streamable-http","notifications"],"what_it_does":"Provides an MCP server (Java 21) that exposes an email-sending capability via an MCP tool named `send-email` and also offers REST endpoints for testing (e.g., POST `/api/test-email`) and health checks. Supports multiple transports for MCP clients (STDIO, SSE, and Streamable HTTP) and forwards email delivery to an SMTP server (Gmail SMTP supported with TLS/app passwords per the README).","use_cases":["Integrate AI/MCP assistants with email sending workflows","Programmatically send transactional notifications (e.g., reminders, completion emails) from MCP-capable clients","Local testing of MCP tool behavior via a REST endpoint","Send emails through different SMTP providers using the same MCP interface"],"not_for":["Production email delivery without additional hardening (credential management, abuse prevention, input validation, observability)","Bulk/spam email sending or any workflow requiring strong deliverability controls not described in the README","Environments that cannot expose SMTP credentials or cannot run outbound SMTP connections"],"best_when":"You need a locally hosted MCP server that bridges an MCP client (e.g., Claude Desktop) to an SMTP provider for controlled, low-volume notifications/testing.","avoid_when":"You require first-class enterprise auth (OAuth) and fine-grained authorization, strong anti-abuse controls, or fully documented API contracts beyond the README.","alternatives":["Use a dedicated email service API (e.g., SendGrid/Mailgun/AWS SES) with their SDKs and IAM auth","Build a lightweight MCP server around a maintained email provider SDK","Use SMTP directly from your application without an MCP layer"],"af_score":56.0,"security_score":31.8,"reliability_score":35.0,"package_type":"mcp_server","discovery_source":["github"],"priority":"low","status":"evaluated","version_evaluated":null,"last_evaluated":"2026-04-04T19:49:26.379658+00:00","interface":{"has_rest_api":true,"has_graphql":false,"has_grpc":false,"has_mcp_server":true,"mcp_server_url":null,"has_sdk":false,"sdk_languages":[],"openapi_spec_url":null,"webhooks":false},"auth":{"methods":["SMTP username/password (including Gmail app password per README)","No user-facing API authentication described for the MCP/REST endpoints; appears to rely on the host being trusted"],"oauth":false,"scopes":false,"notes":"The README instructs embedding SMTP credentials in `Application.java`. No authorization mechanism (API keys, OAuth, IAM, or scopes) for calling the MCP server or REST endpoints is described."},"pricing":{"model":null,"free_tier_exists":false,"free_tier_limits":null,"paid_tiers":[],"requires_credit_card":false,"estimated_workload_costs":null,"notes":"Self-hosted open-source project; costs depend on your SMTP provider (e.g., Gmail app password) and infrastructure."},"requirements":{"requires_signup":false,"requires_credit_card":false,"domain_verification":false,"data_residency":[],"compliance":[],"min_contract":null},"agent_readiness":{"af_score":56.0,"security_score":31.8,"reliability_score":35.0,"mcp_server_quality":80.0,"documentation_accuracy":70.0,"error_message_quality":null,"error_message_notes":"README includes a sample error response for REST (500) and troubleshooting guidance (e.g., AuthenticationFailedException), but detailed machine-readable error schema for MCP tool calls is not provided in the visible content.","auth_complexity":30.0,"rate_limit_clarity":40.0,"tls_enforcement":70.0,"auth_strength":20.0,"scope_granularity":10.0,"dependency_hygiene":45.0,"secret_handling":20.0,"security_notes":"Security depends heavily on deployment. README indicates SMTP TLS is configurable and Gmail app passwords are used, which is better than plain passwords, but the instructions show SMTP credentials hard-coded in `Application.java` (weak secret handling). No endpoint-level authentication/authorization or anti-abuse controls are described for the REST/MCP interfaces, so the server could be abused if exposed. Dependency hygiene is not assessable from the provided README/repo metadata alone. TLS is likely used for SMTP if configured (e.g., port 587 with STARTTLS), but there is no clear enforcement statement for all cases.","uptime_documented":20.0,"version_stability":35.0,"breaking_changes_history":40.0,"error_recovery":45.0,"idempotency_support":"false","idempotency_notes":"A retry mechanism is mentioned, but there is no documented idempotency strategy (e.g., deduplication keys) to prevent duplicate sends on retries.","pagination_style":"none","retry_guidance_documented":true,"known_agent_gotchas":["No documented auth for HTTP endpoints; ensure your environment is trusted or place it behind a firewall/reverse proxy.","Because credentials appear configured in code per README, agents must be careful not to leak secrets and should prefer environment-variable/config injection if available in the project code.","Email-sending operations are side-effecting; agents should avoid repeated calls unless the tool/reporting is designed to be safe.","Transport selection matters (`--stdio`, `--sse`, `--streamable-http`); wrong transport arguments may cause connection failures."]}}