MailScanner and mailing lists

[Eric H]

What happens when a mailing list of maybe a couple of hundred or even
thousands of subscribers goes off, either Majordomo or GNU Mailman? Is
that going to pound on the the machine running MailScanner?

I imagine that if there were no attachments then the virus scanner
wouldn't be a consideration, but what about how it calls SpamAssassin?
Would every message be scanned individually?

Eric