know if someone reads an email?

Is there anyway to know if someone you send an email too has read it or not? Any sort of online/software?

Thanks

You can send a read receipt, but the recipient can choose to not send a read receipt, so not really.
I guess you could embed an image (1x1px white) and then check your hosting/server log to see if it got a hit.
 
Even that won't work, because email software may not automatically load images or other HTML until commanded. Like Gmail for instance (yet another great feature). So the 1px gif is also not reliable.
 
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