* lisp/gnus/nnimap.el (nnimap-open-connection-1): Always query
capabilities, so that a 'plain value for the `nnimap-stream' server
variable is handled correctly.
* doc/misc/gnus.texi (Customizing the IMAP Connection):
Document the 'plain option.
can use this option, and customize @code{nnimap-shell-program} to be
what you need.
+@item plain
+Non-encrypted and unsafe straight socket connection.
+@acronym{STARTTLS} will not be used even if it is available.
+
@end table
@item nnimap-authenticator
:return-list t
:shell-command nnimap-shell-program
:capability-command "1 CAPABILITY\r\n"
+ :always-query-capabilities t
:end-of-command "\r\n"
:success " OK "
:starttls-function