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How to get dovecot use the from in sieve in the envelope?

obviously this is set: sieve_vacation_send_from_recipient = yes

At first I thought maybe it was some spf/dmarc related setting. But this script is sending out the test message. I need the vacation to use/add the -f option.

#!/bin/sh

FROM='test@example.net' TO='xxxxx@gmail.com' /usr/sbin/sendmail -f $FROM -i -t << MESSAGE_END To: ${TO} From: ${FROM}

Hi, this is my message, and I'm sending it to you! MESSAGE_END

Adding/changing this to dovecot lda_original_recipient_header = X-Original-To

sieve_vacation_use_original_recipient = yes sieve_vacation_dont_check_recipient = yes sieve_vacation_send_from_recipient = yes

Adding this to sendmail.mc LOCAL_CONFIG H?${u}?X-Original-To: $u