htmlentities() used in email sent

[orange08]

hi, i use htmlentities() in an email sent to user for the confirmation of registration...

 

for the user name and user email input by an user, i apply htmlentities() like

 

$myuser = htmlentities($user);
$useremail = htmlentities($uemail);

 

then this two variables are used to display in an email sent to the user, like

 

$msg="<table><tr><td>";
$msg.="Dear $myuser,";
$msg.="bla bla bla";
:
:
$msg.="<a href='http://www.mysite.com/register.php?sentemail=$useremail&key=$ukey'>activate link </a>";
:
:
$msg.="please copy and paste the following link to your browser.<br><br>";
$msg.="http://www.mysite.com/register.php?sentemail=$useremail&key=$ukey";
:
:

so, any problem i use htmlentities() in the variable display and the activate link? i tested it and found it works normally, but if really got xss attack in that two variables, what will going on to my email? will create any error?