When sending an email in SAS in the subject, how do I have it put in yesterday's date?

[RYPD_User]

My code has the following:

FILENAME MailBox2 EMAIL "&email_delivery_address" SUBJECT="Email For &SYSDATE9" content_type="text/html";

The output for the email subject line is for the current day.  How do I have the date be for the previous day?  (yesterday)

[PaigeMiller]

%let yesterday = %eval(%sysfunc(today())-1);
filename MailBox2 email "&email_delivery_address" 
    subject="Email For %sysfunc(putn(&yesterday),date7.)" 
    content_type="text/html";