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I don't run Windows servers, so I can't tell you where the IP address is set, but it may be in Properties for the network card (Control Panel/Network). If there's a specific IP address entered...

Yes.

Contact your hosting company. (If it's your own server, your ISP may block emails not sent to their server. Most of them do now.)

The data will be neither corrupted nor stolen (that's data integrity) by storing HTML line ends.

You're looking at the server load, I'm looking at the user experience. It depends on how much data...

Formatting after you get the data from the database takes a finite amount of time. The goal is to get the page to the user as fast as possible. (It's been found that a large majority of users will...

Is the server set to get an IP address from the router, or are you giving it a static address? (If you have it set to a different subnet than the router, it won't see the router or the internet.)

You have

if() {
} else {
if() {
} else
...

It should be

The example at http://php.net/manual/en/book.json.php should help you. It's only sending one name/value pair - comment. You can define a lot more of them. (It uses jQuery to make the AJAX part...

That looks like jQuery. You can use

$('#button1').css()

to set the location or change the alignment of the button.

If you're using the text to display it in a browser, I'd store it with <p> tags. Why have to convert after selecting? It may eventually cost you another MB or two of storage space, but that's...

You can't fully validate an email address without sending an email to the address and requiring that the recipient responds to it.

You can check the DNS record for either an MX record or an A...

Of course, if you just send the pdf file to the user, it will display in his browser the same way any pdf file does. You only have to convert it if you don't want it to look like a pdf file.

Contact your hosting company's tech support and ask if they give your site SMTP access. Not all hosts and/or all accounts do. If they don't, you'll have to ask them to enable it for you. If they...

PHP sends the http header by itself. Just echo the text you want sent to the user.

There are a few options. NogDog's way is one. You can jump to different functions in the same file.

$choice = isset($_POST['some_field']) ? $_POST['some_field'] : '';
if($choice == 'c')
...