I need to send hundreds of pictures via email. The size is reaching 100s of MBs .. which is certainly burden on network.

WinRar, 7-Zip aren't helping .. 

Would you like to suggest any software which can carry out compression so that I can reduce the size and send it via email, and decompress it at the other end ..

opensource or freeware are more preferred .. paid-versions are appreciated too 

> 
> Edit: I am seeking an alternative
>  software for winrar and 7-zip which is
>  more efficient in compressing .. but
>  still not losing any data ..
> 
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