deprecated: iconv_set_encoding()

Hi,
I got the following error on our website:

Deprecated: iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /wp-content/plugins/mailplus-forms/Zend/Validate/Hostname.php on line 553

Deprecated: iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /wp-content/plugins/mailplus-forms/Zend/Validate/Hostname.php on line 649

I found the following solution which seems to be working:
Replace line 553 with:

if (function_exists('iconv') && PHP_VERSION_ID < 50600)
{
    // These are settings that can be set inside code
    iconv_set_encoding("internal_encoding", "UTF-8");
} 
elseif (PHP_VERSION_ID >= 50600) 
{
    ini_set("default_charset", "UTF-8");
}

Replace line 649 with:

if (function_exists('iconv') && PHP_VERSION_ID < 50600)
{
    // These are settings that can be set inside code
    iconv_set_encoding("internal_encoding",  $origenc);
} 
elseif (PHP_VERSION_ID >= 50600) 
{
    ini_set("default_charset",  $origenc);
}