[AccessD] Automated Emails from Access - Questions on How to Prevent Emails from Being Categorized As Spam

We are putting together a small Access 2007 Application which will
automatically send Emails when orders are received and when orders are
shipped.

Everything seems to be working nicely in our initial system tests.

However, this is new territory for us and we have some concern that our
automatically generated Emails will be categorized as spam by the
various Emails programs that are used by our customers who will be
receiving our Emails.

Admittedly, these questions are more "Email" questions than "Access"
questions, but I thought that some of you many have run into these
issues previously and may be able to point us in the right direction.

What can be done to prevent an outgoing Email from being classified as
spam?

In the Email header info, I can see the computer name like this...

from dell-999 ([0.0.0.0]) by AcmeLtd.com

We would like to use an Email "From" address like
"Order_Confirmation at AcmeLtd.com.

Do we need to have the "computer name" equal to the "From" in order to
reduce the chances of our Emails being classified as spam?

Again, this is a new area for us.  We have tried to find info on the
internet, but no relevant articles have been found so far.   

Thanks in advance for your help, insights, advice.

Brad

PS.  A couple weeks ago, my wife and I visited the Hormel Spam Museum in
Austin, Minnesota.  One of their many displays is a video of the Monty
Python "Spam" skit which some people claim was the origin of the word
"spam" (as in unwanted Email).