Apache Commons Net implements the client side of many basic Internet
protocols. The purpose of the library is to provide fundamental protocol
access.

Supported protocols are:

    * FTP/FTPS
    * FTP over HTTP (experimental)
    * NNTP
    * SMTP(S)
    * POP3(S)
    * IMAP(S)
    * Telnet
    * TFTP
    * Finger
    * Whois
    * rexec/rcmd/rlogin
    * Time (rdate) and Daytime
    * Echo
    * Discard
    * NTP/SNTP

WWW: http://commons.apache.org/proper/commons-net/