if such addresses are undef they will be processed, being undef a possibility; it's up to you to check if is valid for you.

Notice also to add use strict; use warnings; in your programs.

As useful design pattern, put exit conditions as soon as possible:

foreach my $address (@email) {

       next unless $address;
       ..

       # or something more evoluted:
       unless (my_validate_mail_add($address)){
          warn "'$address' is not a valid address";
          next;
       }
       ..
}
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