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-rw-r--r--fetchmail.man11
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diff --git a/fetchmail.man b/fetchmail.man
index ffc95d43..487eb7b9 100644
--- a/fetchmail.man
+++ b/fetchmail.man
@@ -254,6 +254,17 @@ work --
has to bind to a privileged port locally in order for the mail
server to believe it's allowed to bind to a privileged remote port.)
.PP
+RFC1460 introduced APOP authentication. In this variant of POP3,
+you register an APOP password on your server host (the program
+to do this with on the server is probably called \fIpopauth\fR(8)). You
+put the same password in your
+.I .fetchmailrc
+file. Each time
+.I fetchmail
+logs in, it sends a cryptographically secure hash of your password and
+the server greeting time to the server, which can verify it by
+checking its authorization database.
+.PP
.SH OUTPUT OPTIONS
The default behavior of
.I fetchmail