That's a little naive and a bit mean, it should be your responsibility not to send malware/viruses not the recipient to protect themselves from you.
Do you realize where the actual problem lies?
Microsoft, Adobe (Flash) and Oracle Java are for the most part responsible for releasing unsafe software full of holes, and then there are millions of 'Dummies' downloading illegal software-Music-Movies full of malware/Viruses, now is that my problem to be responsible for the carelessness of those companies/people?
As far as I know most people/companies are fully aware of those threats and have Virus scanners installed, they should be the one taking responsibility and there is another thing...
A couple of years ago I expected Microsoft to rewrite Windows, they should have done what Apple did, go to Linux or Unix, sadly for them and millions of people they are still stuck with a garbage OS.
Windows 7 works fairly well/good, but it's garbage because it is so easily attacked by malware/viruses.
(And of course the afore mentioned third party software developers.)
Don't call me naive or mean, I don't want people to get Malware/viruses but they can't expect from me to be running a virus scanner on a OS that doesn't have viruses!
I don't send many emails anymore, and I certainly don't send whatever crap to people like so many do, like jokes, funny pictures or video I downloaded from the internet.
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I see this mentioned often here at MR, but tell that ("it's their problem") to a client you sent a virus to along with your MS Word .doc. What do you think they would say?
I don't run AV on my Mac because I don't send out anything other than the occasional PDF. But if operating in a business environment where files are exchanged with Windows users, I would certainly be running an AV app. It just makes sense from a business standpoint.
I very much respect you here on Macrumors, always good to read your posts but this time I have to disagree with you.
Plenty of old farts (no names) here on MR would also disagree with you, just read my response to cookiesnfooty above,