GMail does some really interesting analysis on e-mails. It even somehow managed to detect and block a file I wanted to send demonstrating a dcraw parser bug in a really obscure camera RAW image format.
Yeah I'm just surprised it's going to be scanning zips with the industry standard malware password for ... malware.
If it didn't, malware devs could just send malware zipped in a password protected folder with that password and tell users to enter that password to unzip.
Correct in regards to "infected" being used industry-wide for malware infected zips