Further to jwkrahn's post:   tel2: Note that implicit split to @_ has been deprecated for a long time:

Win8 Strawberry 5.8.9.5 (32)  Thu 10/07/2021  3:29:50
C:\@Work\Perl\monks
>perl -Mstrict -Mwarnings
my $data = <<'EOD';
me@here.com
those@there.com  others@there.com
you@there.com,them@there.com
EOD

open my $fh, '<', \$data or die "opening: $!";

while (split(/[, ]+/, <$fh>))
{
  chomp @_;
  print "'$_'\n" for @_;
}
^Z
Use of implicit split to @_ is deprecated at - line 14.
'me@here.com'
'those@there.com'
'others@there.com'
'you@there.com'
'them@there.com'
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