C語言的SMTP客戶端開發包 libESMTP

libESMTP是一個SMTP客戶端，使用預配置的MTA管理電子郵件。

• libESMTP supports many SMTP extensions, notably PIPELINING (RFC 2920), DSN (RFC 1891) and SASL authentication (RFC 2554).
  
  
• libESMTP is efficient. Because it buffers all network traffic, when used in conjunction with a pipelining SMTP server libESMTP significantly increases network performance, especially on slow connections or those with high latency. Even without a pipelining server libESMTP offers much better performance than would be expected with a simple client.
  
  
• libESMTP is not intended for use as part of a program that implements a Mail Transport Agent. This is not because the code is unsuitable for use in an MTA, in fact the protocol engine is significantly better than those in many MTAs. Rather, by eliminating the need for MX lookup and next-hop determination, the design of libESMTP is simplified; thus goals are made achievable. Besides, such features are undesirable in a program that is not an MTA, particularly if the client is behind a firewall which blocks access to port 25 on the Internet.

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