#!/bin/bash
for I in `cat list_adresses`; do cat body | mutt -e "set content_type=text/html" -a
"/path/to/directory/File_name_29.04.21" -s "Тема письма" -- $I < body;echo $I;sleep 1 ;done
attach=$(ls /path/to/file/ | grep File_name)
-a "/path/to/file/$attach"