This should be the correct answer, but I don't think the string is correctly encoded. This:

use Encode qw(decode);

my $str = 'username, A Ne=?UTF-16?B?dwAgAEMAcgBlAGQAaQB0ACAAQwBhAHIAZA
+AgAEMAbwB1AGwAZAAgAEIAZQAgAEgAZQBhAGQAZQBkACAAWQBvAHUAcgAgAFcAYQB5AA=
+=?=';

my $chr = decode('MIME-Header', $str);

print "$chr\n";
[download]

Gets me:

UTF-16:Unrecognised BOM 7700 at /.../Encode/MIME/Header.pm line 81.
[download]

While this:

use MIME::Base64;

my $cstr = 'dwAgAEMAcgBlAGQAaQB0ACAAQwBhAHIAZAAgAEMAbwB1AGwAZAAgAEIAZQ
+AgAEgAZQBhAGQAZQBkACAAWQBvAHUAcgAgAFcAYQB5AA';

my $chk = decode_base64($cstr);
print "$chk\n";
[download]

Gets me:

w Credit Card Could Be Headed Your Way
[download]

So the part that is supposed to be UTF-16 appears to be just base64 encoded.

UPDATE: And if you change 'UTF-16' in the first part to 'UTF-8', then it is correctly decoded without error.

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