blaze - 6:13 am on May 3, 2004 (gmt 0)

One thing the thread is missing though, is actually getting the email to the customer. This is probably the biggest stumbling block of all.

Some things I have found useful:

1. Make sure the customer can get an exact copy of the email receipt at the end of the transaction via the web browser. It's quite possible that the email won't actually get to the user, so don't use that as your only receipt for the customer.

2. Make sure you have a reverse IP address on your MTA mailer
3. Make sure the headers on your outbound email are all valid (they have don't have something like nobody@localhost)
4. Make you are not on any RBLs for email spam

.. any other things people do to make sure their email doesn't get blocked?