Torrential Web Dev

There have been some requests to revisit the contacting a contact list tutorial and include additional features. Some of the requests have been for features mentioned in my original follow up dealing with some of the potential problems. That's great but until now I've avoided writing such an article. The main reason being that much of the functionality would need to be deeply integrated with an entire site and so everyone would need a custom solution. I've finally decided that a generic example may make it easier for people to implement their own custom solutions and as such here it is.

I feel the improvements I'm going to include are really important so to ensure that everyone can make use of this tutorial I'm going to take a step back and develop it in PHP4. I suspect there may still be some using PHP4. This will likely be the last time I worry about compatibility with PHP4. In the new year it will be PHP 5 all the way.

The Original

For those who haven't seen the original article it

1) Requested login details for gmail or msn messenger (not the same as hotmail)
2) Logged in to the service and fetched the contact details
3) Listed all contacts and enabled the user to choose which should be contacted
4) Sent an email to all requested contacts.

Improvements

This updated tutorial will show how to the above and also the following

1) Defend against malicious attacks
2) Prevent duplicate messages from being sent
3) Allow recipients to opt out of future messages

If you have read the follow up post to the original tutorial you'll see that the improvements are focused around minimising the problems surrounding unsolicited email rather than improving the efficiency of the process. Those potential improvements are really beyond what can sensibly be included in a generic tutorial like this one.

So, without further introduction lets get started. Continue reading "Contacting a contact list: A tutorial - revisited"