Why can't I send any WEBMAIL from my Internet connection?

I do subscribe and use Google mail (GMail) as my E-mail service. More and more, whenever I E-mail businesses or firms though their web mail, my mail pieces will not send! How / what settings should I make to my Internet connection to allow me to use their web mail access to send mail? Without having to... show more I do subscribe and use Google mail (GMail) as my E-mail service. More and more, whenever I E-mail businesses or firms though their web mail, my mail pieces will not send!
How / what settings should I make to my Internet connection to allow me to use their web mail access to send mail? Without having to REGISTER for an account on their server, I want to mail each company, directly if I can.
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