+.SS Special Handling
+A few functions have different behavior depending on what command they are
+being invoked from.
+.PP
+In
+.BR repl
+the (\fIformataddr\fR\^) function stores all email addresses encountered into
+an internal cache and will use this cache to suppress duplicate addresses.
+If you need to create an address list that includes previously-seen
+addresses you may use the (\fIconcataddr\fR\^) function, which is identical
+to (\fIformataddr\fR\^) in all other respects. Note that (\fIconcataddr\fR\^)
+will NOT add addresses to the duplicate-suppression cache.