用php邮件发送的邮件未显示

Question

I have recently changed my OS from Ubuntu 11.10 to Debian 7.0.0 due to some problems I was having with Ubuntu. I have set up LAMP using Apache 2. Most things appear to be working about the same but mail, which was working fine on Ubuntu, is now not working properly. I use the following code.

    $mailDelivery=mail($to,$subject,$message,$headers);
    if ($mailDelivery)
    {
        ?>
        <script type="text/javascript">
        alert("Mail delivery successful");
        </script>
        <?php
    }
    else
    {
        ?>
        <script type="text/javascript">
        alert("Mail delivery failed");
        </script>
        <?php
    }

I checked the input arguments to mail() and they are the same as the ones that worked successfully on Ubuntu. Also, the alert box returns

Mail delivery successful

However, the mail does not show up at the address (which is one of my on-line addresses).

I looked at php.ini and it has the following lines

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25

There is nothing about mail delivery in /var/log/apache2/error.log.

I also checked my spam folder at the destination email address and there was nothing there.

I also transferred the iptables from Ubuntu to Debian by doing

iptables-save >iptables.save

on Ubuntu, copying iptables.save over and

iptables-restore <iptables.save

I also did the following calls with the following results.

peter@app-server:/var/www$ sudo cat /var/log/mail.err
peter@app-server:/var/www$ sudo cat /var/log/mail.log
peter@app-server:/var/www$ sudo cat /var/log/mail.warn
peter@app-server:/var/www$ sudo cat /var/log/mail.info
peter@app-server:/var/www$ 

Answer 1

OK. I found the source of my problem. I had not installed the SMTP server. I ran

sudo apt-get install postfix

and that fixed the problem.