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This client is well tested and heavily used at HubSpot.\n\n### Maven Dependency\n\n```xml\n\u003cdependency\u003e\n  \u003cgroupId\u003ecom.hubspot\u003c/groupId\u003e\n  \u003cartifactId\u003eNioSmtpClient\u003c/artifactId\u003e\n  \u003cversion\u003e1.1.0\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n### Features\n\n- High performance, designed to handle many concurrent connections\n- Supports TLS, pipelining, chunking, `SIZE`, `SMTPUTF8`, and other ESMTP RFCs\n- Send from specific IP addresses\n- Optionally keeps connections alive to send subsequent emails\n- Parses the `EHLO` response and chooses the most-efficient sending method\n- Interceptor support to modify or instrument commands\n- Comprehensive unit and integration tests\n\n## Dependencies\n\nThis project depends on Java8, Netty, and Guava.\n\n## Java Docs\n\nSee http://github.hubspot.com/NioSmtpClient/1.0.0/\n\n### Notes For Developers\n\n- NEVER execute blocking commands on an eventloop thread (i.e. `CountDownLatch.await` or `Future.get`)\n  - Calls out to unknown functions (i.e. callbacks or event listeners) should always be done on isolated thread pools.\n  - Slow but not necessarily blocking operations should also be avoided\n- Attempt to avoid doing long running tasks on event loop threads\n- Use `new` as sparingly as possible to avoid creating garbage:\n  - Share objects when possible\n  - Use netty bytebuf allocators when possible\n  - Use netty recyclers for objects that can be recycled.\n\n## License\n\nApache 2.0\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhubspot%2Fniosmtpclient","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fhubspot%2Fniosmtpclient","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhubspot%2Fniosmtpclient/lists"}