I have updated to FortiOS 7.2.3.
And then I realized following bad configuration.
FG60F # config system email-server
FG60F (email-server) ## set reply-to email@example.com
command parse error before 'reply-to'
Command fail. Return code -61
FG60F (email-server) #
By this Document, I can set 'reply-to'.
someone have how to config 'reply-to' in FortiOS 7.2.3?