[S-mailx] Headline and display recipient

[Giannis-2]

Hi, I try to make an output format "status_msg, number_msg, sender, date, 
recipients," with "headline",  when i use the command mailx -f  mailbox-1
but i can not find the format specifier for "display recipients"
I read the https://www.sdaoden.eu/code-nail.html#435 , but i did not find 
anything relevant.