Yep... understood now about "value". And yes, I substituted my actual e-mail address as you kindly showed me.
The script is actually a custom addon script to both my "subscriptions.php" and "dopurgemessages.php" files which used to send an e-mail to me showing how many subscriptions were sent out each night as well as how many PMs had been deleted from the database. I have a cron set to delete all PMs over 30 days old. All subscriptions are successfully sent out and PMs are deleted as intended. The problem is with these two e-mails that are supposed to be sent to me personally with the subscription count and PM deletion count.
They were both working fine until my ISP made some changes to their e-mail server configuration.