Hi again, sorry to be a pest.
Trying out my homemade webpage.
I have apache2 working, I have php, I have a form to email php script, I click submit, get no error, but also no email. Reading about this, I think the script can't find sendmail. Here is the bit of send_mail.php that sends the email

// If we passed all previous tests, send the email then redirect to the thank you page.
else {
mail( "$webmaster_email", "Feedback Form Results",
$comments, "From: $email_address" );
header( "Location: $thankyou_page" );
}
Must I somehow tell php where sendmail is?? Should a simple 'mail' in the script work??

pedro@pedro-bedro:~$ whereis sendmail
sendmail: /usr/sbin/sendmail /usr/lib/sendmail /usr/share/man/man1/sendmail.1.gz
pedro@pedro-bedro:~$

And this sendmail_path /usr/sbin/sendmail -t -i comes from is from testing.php which is just <?php
phpinfo();
?>, so php is seeing the path to sendmail correctly.

Do you have access to the mail log on the server? It's usually /var/log/mail or something similar. Do the messages show up in the log?

Ok, it is 0712 am here. I just tried my webpage out again, put some text in the contact page and clicked submit: here is /var/log/mail

status=bounced (gmail.com)
Jul 17 07:08:05 pedro-bedro postfix/cleanup[2820]: B21136C2148: message-id=<20120716230805.B21136C2148@pedro-bedro>
Jul 17 07:08:05 pedro-bedro postfix/bounce[2823]: 61FF96C2144: sender non-delivery notification: B21136C2148
Jul 17 07:08:05 pedro-bedro postfix/qmgr[1772]: 61FF96C2144: removed
Jul 17 07:08:05 pedro-bedro postfix/qmgr[1772]: B21136C2148: from=<>, size=2024, nrcpt=1 (queue active)
Jul 17 07:08:05 pedro-bedro postfix/local[2824]: B21136C2148: to=<www-data@pedro-bedro>, relay=local, delay=0.23, delays=0.07/0.02/0/0.15, dsn=2.0.0, status=sent (delivered to mailbox)
Jul 17 07:08:05 pedro-bedro postfix/qmgr[1772]: B21136C2148: removed

I do not get any error message from Firefox or any other program. I also do not get an email from the contact page.

Any tips??

I am only trying this from home, maybe the program cannot access the internet??

Can not really help you with this one.

The first line of the log reads status=bounced (gmail.com). Makes me think that gmail did not accept the message and your program is probably fine.

Further, also it probably does not matter here, you should check the return value of the mail command.

One comment:
please post logs and code between code tags ([code] and [/code]). Makes them easier to read.