my $sendmail = "/usr/sbin/sendmail";
open (MAIL, $sendmail) or die "cannot open sendmail";

You open sendmail for reading, which succeeds. The prints, however, do not succeed. It's not common to do, but you could write: 

print MAIL "To: Adminmail\n" or die $!;

[download]
to find that out (I hate it, but when debugging, it can really aid)

Instead, you will have to open sendmail as a write-only pipe. 

open MAIL, "| $sendmail" or die $!;

[download]
or, better yet: (Perl 5.6+) 
open MAIL, '|', $sendmail or die $!;

[download]

Sendmail expects the to-address on the command line, so it will still not work. You do NOT want that, so you're going to avoid it by putting "-t" on the command line instead. While you're at it, add "-oi" too, to avoid having to end with a single dot on a line. 

my $sendmail = '/usr/sbin/sendmail -t -oi';
open MAIL, '|', $sendmail or die $!;

[download]

Of course, best is to use one of the many existing mailing modules instead. 

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W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

In reply to Re: Contact Form 2 by Juerd
in thread Contact Form 2 by venimfrogtongue

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