Junk Email forwarding to the Pager

I recently inherited the my groups PagerDuty. The way my org has this set up is if an email is sent to a mailbox, it forwards to PagerDuty.

We have email spam filtering on, and it works quite well in Outlook, however the mail will come in, move the email to junk, and still forward the spam to PagerDuty, thus alerting us. Any help or thoughts would be appreciated.