Thanks Chris. A useful answer that's much appreciated :)You can post with PHP using cURL or doing it yourself manually. Search the archives for this, as the previous answers to this are more complete than what I have time to explain now. Here is a quick example of the manual approach:
And yeh, after just after posting I realised my example using Google was a bad one with of the GET/POST thing. Just tried to pick a generic site as an example as what I'm intending to do is probably too much hassle to explain in full.
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php