Just searching through our error logs and I found that Jetpack is returning this warning when toggling the Post By Email function:
call_user_func_array() expects parameter 1 to be a valid callback, non-static method Jetpack_Post_By_Email::module_toggle() should not be called statically
Called at /var/www/nginx/primaryblogger/wp-content/plugins/jetpack/jetpack.php (Line 1010)
No functionality is lost.
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