Am facut un mic test, si daca stergi linia font-height in visited va merge.

Cod:
a.inbox:visited {

  font-family: Georgia, "Times New Roman", Times, serif;

  font-size: 12px;

  line-height: normal;

  color: #0066CC;

  text-decoration: none;

  font-style: normal;

  padding-left: 5px;

  padding-right: 5px;

}
P.S. andy - daca nu ai nimica de spus, mai bine nu spui nimica.