Using AppleScript for a Complicated Apple Mail Rule

My son's daycare sends us an e-mail with a link to pictures they take of kids during the day. It's adorable. I like to forward this e-mail to both sets of grandparents. One small problem - he only goes there 3 days per week, but e-mails arrive daily. Mission - avoid spamming the grandparents. The daycare used to put the day of the week in the Subject line and that made it very easy to set up rules in the Mac Mail app to handle the automatic forwarding. Lately, all Subjects are the same. So, AppleScript to the rescue - forward the message only if it arrives on specified days of the week. Disclaimer - I do not know AppleScript. Not even a little bit. So it's a lot of Googling and trial and error to get these occasional scripting attempts of mine to work. Here's what I cobbled together:

using terms from application "Mail"

on perform mail action with messages these_messages for rule theRule

repeat with eachMessage in these_messages

set theDate to the date received of eachMessage

set theWeekday to weekday of theDate

--display alert (theWeekday)

if theWeekday = Monday or theWeekday = Wednesday or theWeekday = Friday then

tell application "Mail"

set addressList to {"user1@yahoo.com", "user2@gmail.com"}

set theMessage to forward eachMessage --with opening window

tell theMessage

repeat with i from 1 to count addressList

make new to recipient at end of every to recipient with properties {address:item i of addressList}

end repeat

delete bcc recipients

delete cc recipients

end tell

send theMessage

end tell

end if

end repeat

end perform mail action with messages

end using terms from

Save the script to ~/Library/Application Scripts/com.apple.mail and set up a rule in Mail app with "Run AppleScript" action pointing to this script.

Tidbits to note: the if statement checks whether the message was received on specific weekdays I am interested in; I had to use a list ("addressList") and subsequently iterate over it to accommodate multiple recipients.