-The fetchmail code was developed under Linux and should be readily portable
-to other UNIX systems (it uses GNU autoconf). It has also been ported to
-QNX; to build under QNX, see the header comments in the Makefile.
+Fetchmail supports all standard mail-retrieval protocols in use on the
+Internet: POP3 (including some variants such as RPOP, APOP, KPOP), IMAP4rev1
+(also IMAP4, IMAP2bis), POP2, IMAP4, ETRN, and ODMR. On the output side,
+fetchmail supports ESMTP/SMTP, LMTP, and invocation of a local delivery agent.