[Cyril_HN]

What if you send a photo to an iPhone user that is gets false-positived, aren't you also at risk?

Basically, is it with interacting with Apple users if you are worried about that problem?

[dwaite]

Don't forget hosted email providers scanning attachments. Best to stick to voice and snail mail.

[kenjackson]

Actually voicemail and calls can (and are) scanned for content as well. Best to stick with in-person conversations only, not around any technology that has a microphone.