I've been looking some similar examples and slight changes to them to perform that but unsuccessfully.
This is the first recipe at $HOME/.procmailrc of the user "me".
Mail is received by user@domain.tld but the auto response is not sent.
Centos 7, Postfix
procmail log doesn't say anything about that.
:0
* ^FROMuser@domain.tld
* !^FROM_DAEMON
* !^FROM_MAILER
* !^X-Loop: me@me.tld
| (formail -rk \
-A "X-Loop: me@me.tld" \
-A "Precedence: junk"; \
echo "Testing";\
echo "This is an automated response";\
echo "Not sure to see your message";\
echo "So please try again tomorrow" ) | $SENDMAIL -t -oi