Some say that Google’s near monopoly in search ads puts it in a position to decide which business models it will tolerate and which ones it won’t.

To the Editor:.

Letters in response to a recent article about tax cuts.

The basic Internet e-mail standard provides for the destination server to send back an error message if a message cannot be delivered — but even in this case, mistakes do happen.

Zev Weiss is the chief executive of the American Greetings Corporation.

Letters from readers concerning the article “Freer Trade Could Fill the World’s Rice Bowl”, published on April 27.

E-mail has become the bane of some people’s professional lives.