-The fetchmail code was developed under Linux, but has also been
-extensively tested under 4.4BSD, AIX, HP-UX versions 9 and 10,
-SunOS, Solaris, NEXTSTEP, and OSF 3.2.
+Fetchmail supports all standard mail-retrieval protocols in use on the
+Internet: POP3 (including some variants such as APOP, KPOP), IMAP4rev1
+(also IMAP4, IMAP2bis), IMAP4, ETRN, and ODMR. On the output side,
+fetchmail supports ESMTP/SMTP, LMTP, and invocation of a local delivery agent.