Fax without fax device

Now you dont want to search for a fax device to sent fax to someone.You can send fax easily when you are online. You can send particular file as an attachment.Some websites provide these facility.Advertisements are being sent together with these files or send fax twice or thrice a day with some conditions.The websites are......
http://www.gotfreefax.com/
http://faxzero.com/
http://www.popfax.com/


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