Check that echo and netmail is displayed according to the charset of the terminal session

Neo67 writes:

```Telnet displays German umlauts incorrectly in echomail bodies. Example: UTF-8 text appears as CP437/ANSI mojibake like `J├╝rgen`, `├╝ber`, etc. The web UI displays it correctly, so this seems to be a telnet output charset/conversion issue.```

Sounds like it's not converting it back to the proper code page