That is supposedly some EMAIL cc/bcc thing, there are modules on CPAN to deal with that

#!/usr/bin/perl --
use strict; use warnings;
use Data::Dump 'pp';
use Email::Address;
my $line = 'asdf@example.com,qwerty@example.com,bananas@example.com';
my @addresses = Email::Address->parse($line);
pp $line, \@addresses;
$_ .= "" for @addresses; # stringify
pp $line, \@addresses;
__END__
do {
  my $b = [
    bless([
      undef,
      "asdf\@example.com",
      "",
      "asdf\@example.com",
      [
        \"asdf\@example.com,qwerty\@example.com,bananas\@example.com",
        0,
      ],
    ], "Email::Address"),
    bless([
      undef,
      "qwerty\@example.com",
      "",
      "qwerty\@example.com",
      ['fix', 1],
    ], "Email::Address"),
    bless([
      undef,
      "bananas\@example.com",
      "",
      "bananas\@example.com",
      ['fix', 2],
    ], "Email::Address"),
  ];
  $b->[1][4][0] = \${$b->[0][4][0]};
  $b->[2][4][0] = \${$b->[0][4][0]};
  (
    "asdf\@example.com,qwerty\@example.com,bananas\@example.com",
    $b,
  );
}
(
  "asdf\@example.com,qwerty\@example.com,bananas\@example.com",
  [
    "asdf\@example.com",
    "qwerty\@example.com",
    "bananas\@example.com",
  ],
)
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