These are not easy issues for a Continent that cannot agree on a single phone or mail system.

Today, the study of mail systems is known as postal history.

The hole is in the mail system, and the virus spreads over the network.

This process is an integral part of our mail system.

Different electronic mail systems typically cannot communicate with one another.

Officials at the Vatican declined to speak about their mail system.

"And we want Congress to acknowledge how important a healthy mail system still is."

They were far too dangerous and incriminating to actually send through the federal mail system.

It is possible to easily access the mail system from the application.

Now someone is attempting to do the same with the nation's mail system.