Rettifico un'attimo la cosa, prova a fare così:
codice:
<form method="POST" name="logon" onsubmit="reset(this)" action="http://webmail.soniq.com.br/cgi-bin/webmail" target=_blank>
<td class="CobaltFieldCaptionTD">E-mail</td>
<td><input type="text" name="username" size="20"></td>
</tr>
<tr>
<td class="CobaltFieldCaptionTD">Password</td>
<td>
<input type="password" size="8" name="password" maxlength="128">
</select>
</td>
</tr>
<tr>
<td align="right" colspan="2">
<input type="submit" value="Login" name="do.login"></td>