https://github.com/hubspot/niosmtpclient

Smtp Client based on Netty
https://github.com/hubspot/niosmtpclient

email java java8 netty nio smtp

Last synced: 21 days ago
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Smtp Client based on Netty

• Host: GitHub
• URL: https://github.com/hubspot/niosmtpclient
• Owner: HubSpot
• License: apache-2.0
• Created: 2017-03-02T15:56:20.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-09-17T16:09:06.000Z (about 2 months ago)
• Last Synced: 2024-10-15T03:40:13.134Z (21 days ago)
• Topics: email, java, java8, netty, nio, smtp
• Language: Java
• Size: 791 KB
• Stars: 28
• Watchers: 149
• Forks: 24
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
NioSmtpClient [![Build Status](https://travis-ci.org/HubSpot/NioSmtpClient.svg?branch=master)](https://travis-ci.org/HubSpot/NioSmtpClient)

=============

High performance SMTP client in Java based on [Netty](https://netty.io/). This client is well tested and heavily used at HubSpot.

### Maven Dependency

```xml

  com.hubspot

  NioSmtpClient

  1.1.0

```

### Features

- High performance, designed to handle many concurrent connections

- Supports TLS, pipelining, chunking, `SIZE`, `SMTPUTF8`, and other ESMTP RFCs

- Send from specific IP addresses

- Optionally keeps connections alive to send subsequent emails

- Parses the `EHLO` response and chooses the most-efficient sending method

- Interceptor support to modify or instrument commands

- Comprehensive unit and integration tests

## Dependencies

This project depends on Java8, Netty, and Guava.

## Java Docs

See http://github.hubspot.com/NioSmtpClient/1.0.0/

### Notes For Developers

- NEVER execute blocking commands on an eventloop thread (i.e. `CountDownLatch.await` or `Future.get`)

  - Calls out to unknown functions (i.e. callbacks or event listeners) should always be done on isolated thread pools.

  - Slow but not necessarily blocking operations should also be avoided

- Attempt to avoid doing long running tasks on event loop threads

- Use `new` as sparingly as possible to avoid creating garbage:

  - Share objects when possible

  - Use netty bytebuf allocators when possible

  - Use netty recyclers for objects that can be recycled.

## License

Apache 2.0