is there a java api that supports esmtp pipelining?

I've been looking around, 开发者_开发知识库with no luck, for a java mail api that supports ESMTP pipelining. javamail does not, nor does ha-javamail.

does anyone know of an api that supports pipelining?

netscape.messaging.smtp.SMTPClient provide pipelining (download sources here).

From wikipedia : Apache James (since 2.3.0a1)

Although James is a server-side implementation, you may find client-side implementations in the test cases.

Niosmtp supports both NIO and pipelining. It includes a Netty transport layer implementation and uses Apache James Protocols for the protocol layer.