email address removed for privacy reasons email from website contact blocked by Standard Preset Security Policy1653658192934

Hello,

We have a case where our standard rules for mail are blocking requests from our website. Our website's contact form emails email address removed for privacy reasons (replace with our domain).  I am finding these mails quarantined in security.microsoft.com/quarantine. The email address removed for privacy reasons is a DL (not mailbox, not m365 group) that allows external senders.  The quarantine entry shows blocked by Standard Preset Security Policy1653658192934.

What is the best approach to allow these without increasing risk for all users.