I'm not going to debate what is dangerous and what is not.  That being said, I wasn't looking for an anonymous, trust by IP setup necesarily.  What I was looking for was a method to send using a number of email addresses depending on the parent portal and where I want the email to appear to come from.  DNN gives you three choices, Anonymous, Basic and NTLM for SMTP setup.  With the implementation of authenticated email at WH4L, you can only send as the user that is authenticating for the Host.  If the SMTP setting were per portal, it would help a bit, however we don't have that scenario today.

So my solution was to find something that allowed me the flexibility of sending emails from a variety of email addresses, have a reasonable number of mailings per day and still have some security.  Day 2 and it still looks good.  i even get reports of email sent.

Cheers

I am not using more than one domain,  so I may not be able to help you with this, but I have ran into a problem like yours at work.  The way I understand the multiple domains is that you probably have one portal per domain.  For each of the portals you probably have a primary admin user.  The way you can get the multiple domain email to work is to make sure you specify the admin user for each of the portals.  The email should then come from the admin user of that particular portal.  You may have to create an individual email account for each of the portals on WH4L for the sending address, but I am not sure about that.  It also depends heavily on which version of the DNN you are on.  Some of the older versions only had the host address as the from address.  I may not be remembering this correctly but I think that is how it works with multiple portals on multiple domains.  If you have only one portal and multiple domains you will not be able to send from multiple domains, because you can only have admin user assigned per portal.  That is a little vague but I hope that helps. 

 Another thing you might try is using a google account to send. They allow up to 400 messages (approx) per day. Often this is enough.

Even if WHFL are blocking port 25, they may not have blocked the SSL port used for gmail. Just a thought.

David Finley

InteractiveWebs - DotNetNuke Modules / Advanced Microsoft CRM integration / iPhone/iPad Apps