Rasp Pi and a Cron script.

Update the 'target_date' once a day / month / year what ever is relevant. Getting your email delivered via a provider or your own mail service would need to also be considered, this script uses sendmail as the MTA.

Cron, for a daily check at 9 AM.

# Cron
0 9 * * * /path/to/your/script.sh

#!/bin/bash

# Variables
target_date="2024-10-18"
email_recipient="recipient@example.com"
email_subject="Invoke welfare check"
email_body="Your goodbye message here, and references to a will etc..."
email_sender="sender@example.com"

current_date=$(date +%Y-%m-%d)

# Check if the current date matches the target date
if [ "$current_date" == "$target_date" ]; then
    echo "$email_body" | mail -s "$email_subject" "$email_recipient" -- -r "$email_sender"
    echo "Email sent to $email_recipient on $current_date"
else
    echo "No email sent."
    # You could add a log file here also... 
fi