to change the character set of the message that is sent, edit line 15 of the WA_UniversalEmail/WAUE_contact_1.php file:
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","25","","","","");
to:
$WA_MailObject = WAUE_Definition("".($WAGLOBAL_Email_Server) ."","25","","","","UTF-8");
For the checkbox group, you will need to edit the WA_UniversalEmail/Templates/contact.php file. Change the following line:
<?php echo(str_replace("\n","<BR />",$pval)); ?>
to:
<?php if(is_array($pval)) { ?>
<?php echo(str_replace("\n","<BR />",implode(", ",$pval))); ?>
<?php } else { ?>
<?php echo(str_replace("\n","<BR />",$pval)); ?>
<?php } ?>