Is Guest Posting safe?

Ofcourse it is safe if you do it in a proper way.

AngelSeo said:

And this is the best way to get your website penalized/spend money for links that do shit. If the website openly advertise their guest posting opportunities its a BAD choice. ...

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Also, a lot of people using gmail to discuss about guest posting, what is another shot in the foot.

Clever blogger not will publish any information about guest posting and nobody know it, until somebody not will ask about.
In this case, Google have no chance to detect guest posting.

Best regards,
Greg.