pipe, or t or `pty' to use a pty. The value has no effect if the
system has no ptys or if all ptys are busy: then a pipe is used
in any case. The value takes effect when a IMAP server is
-opened, changing it after that has no effect.."
+opened, changing it after that has no effect."
+ :version "21.4"
:group 'imap
:type 'boolean)