removed deprecated mailbox

build/less/mailbox.less

@@ -74,63 +74,4 @@
 }
 .mailbox-attachment-close {
   &:extend(.close);
-}
-
-// ``` These are the rules of the old mailbox, which is now deprecated and will be removed in the a future release ```
-.mailbox {
-  .table-mailbox {
-    border-left: 1px solid @box-border-color;
-    border-right: 1px solid @box-border-color;
-    border-bottom: 1px solid @box-border-color;
-    tr {
-      &.unread {
-        > td {
-          background-color: rgba(0, 0, 0, 0.05);
-          color: #000;
-          font-weight: 600;
-        }
-      }
-      > td > .fa.fa-star,
-      > td > .fa.fa-star-o,
-      > td > .glyphicon.glyphicon-star,
-      > td > .glyphicon.glyphicon-star-empty{
-        color: @yellow;
-        cursor: pointer;
-      }
-
-      > td.small-col {
-        width: 30px;
-      }
-
-      > td.name {
-        width: 150px;
-        font-weight: 600;
-      }
-      > td.time {
-        text-align: right;
-        width: 100px;
-      }
-      > td {
-        white-space: nowrap;
-      }
-
-      & > td > a {color: #444;}
-    }
-  }
-
-  @media (max-width: @screen-sm-max) {
-    .nav-stacked {
-      > li:not(.header) {
-        float: left;
-        width: 50%;
-        &.header {
-          border: 0!important;
-        }
-      }
-    }
-
-    .search-form {
-      margin-top: 10px;
-    }
-  }
 }
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