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$smtp->datasend("Content-type: multipart/mixed; 
boundary=\"frontier\"\n");
...

$smtp->datasend("Content-type: multipart/mixed; 
    boundary=\"frontier\"\n");

my $body   = ....
my $attach = ....  # base 64 encoded data
...
$smtp->datasend($email)
$smtp->dataend()
$smtp->quit;