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$mail{body} += encode_base64(<IN>); # addition won't work

$mail{body} = encode_base64(<IN>); # just assign it

$mail{body} .= encode_base64(<IN>); # just assign it

$mail{body} = <<EOD; <--- delimiter
...
...
$mail{body}
$boundary--
END_OF_BODY          <-- wrong delimiter