Quarantined File, am I in the clear?

While working today, Bitdefender alerted me that it had quarantined a file. Sure enough an email had just come in from someone I didn't know with a suspicious (and kinda scary sounding file name) attachment. I looked at the notification from Bitdefender and navigated to the folder where the file was supposed to be (down many sub levels) and It wasn't there (I assume because Bitdefender quarantined it?).

The notification was in part (I've omitted much of the content of the notification, the path, etc.):

"An infected file attempted to run on your device.

Threat name: URL.Spam.Heur.4

Path: /Users/XXXX/Library/Mail/.....

We quarantined the file to prevent malicious commands from being executed on your device."

I immediately deleted the email, and emptied the Mail trash. I never clicked on the attachment (I am too savvy for that). Then I ran a complete virus scan with Bitdefender, and it came clear, no threats.

So am I now in the clear? Wondering why the file wasn't in the sub folder... because it was quarantined? I think in the past I could find such a file and manually delete it... maybe so?

A bit scary.