There have been a lot of requests on how to use Axon with custom modules so I wanted to post some information here on how to do that.   If there are any questions on this information or if you need to know how to use Axon in another way, post it here and I'll explain in detail how it can be done.

Additional information about this is on the http://dotnetnukeemail.com/GettingStartedwithAxon/AddOnModules/ExtendAxon/tabid/387/Default.aspx

Axon is designed to be used by external applications or other modules, allowing you to use the robust email processing engine in Axon for all of your email needs in your own modules and applications. To control Axon from your own module, add a reference to the core OnyakTech.Axon.dll assembly. Once you do this, you will have access to all of the core functionality in Axon. Most of what you will need is in the OnyakTech.Axon.CampaignEngine class. This class contains methods specifically created for use by external modules.

To work with a Campaign, create an instance of the CampaignEngine class and pass the ID of the Campaign you want to work with as a parameter to the constructor of this class. Once the class is initialized, you can easily run batches, execute a new run, get a list of current runs, etc. You can even use Axon for rendering the content and have it returned to you for display in your modules or email it through your application.

Send Axon Emails based on the Email Address
The following sample code will open campaign, process the content based on the email address you provide (this will render any dynamic content into the email body you have setup in the Campaign for the email address.  For example, if you have added dynamic content in your campaign that displays a users current orders, subscription levels or attached a PDF report with information specific to a user, Axon will match the email address you provided with a user registered in your DotNetNuke web site and then fill in all of the dynamic content that relates to that user.)

Obtain Processed Email Body HTML
Another approach is to call the PreviewRun function passing the email address as a parameter.  This will return the email body contents as HTML that you can then display in your module or send it.  Using this method you won't need to set the FixedList since Axon ignores the campaign recipients and processes the email content based on the email address you pass in the parameter. 

Dim strEmailBodyHTML As String
Dim AxonEngine As New OnyakTech.Axon.CampaignEngine(objCampaign.CampaignSystemID, False)
strEmailBodyHTML = AxonEngine.PreviewRun("somebody@domain.com") ' Returns the HTML for the email

Multithreaded Execution
If you would like to execute a campaign that may contain over 100,000 recipients, you will want to submit the campaign for execution in it's own thread and then check it's progress.

Dim NukeRun As CampaignEngine
NukeRun = New CampaignEngine(CampaignSystemID, True)
thr = New System.Threading.Thread(AddressOf NukeRun.Execute)
thr.Start()

The code above will process the campaign in a new thread.  At set intervals, you can then check it's progress by looking at the StopExecution property as shown below.

If CampaignEngine.workerStatus= True Then
'Campaign has completed it's run.
Else
'Campaign is still running.
lblStatus.Text = "Progress: (" & CampaignEngine.EmailSentCount & " out of " & CampaignEngine.EmailToSendCount & " emails sent)"
End If

Click the link below for information on how to run a campaign from another module.  It contains some sample code that will give you an idea of how to do it.  Let me know if you need more information or have any other questions on this.

http://dotnetnukeemail.com/GettingStartedwithAxon/AddOnModules/ExtendAxon/tabid/387/Default.aspx

Yes you can change the email body content in your code.  I tried to post an example here but these forums are not allowing the code.  Please contact me directly (support @ onyaktech.com) and I will send you some sample code that you can use.  Also let me know if you want the sample code in VB.Net or C#.Net.