I have some problems with sending newsletter. When I send a mail only to administrator role it works fine, but when sending to all users as registered users I get the error :

Error: Newsletters is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Admin.Users.BulkEmail.cmdSend_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

is it because of number of users ?

I run DNN 3_2_2

Leupold,

I seem to have exactly the same problem here.
Is there some kind of suggestion on how to fix this?

Leupold,

Using 4.5.1.

I deleted the log :( ... but I do know that the emails are not being sent (a lists of 535 emails).

Also, weird enough, I do get the email that says that the email was sent to X amount of people, but the actual emails are not delivered.

Hope this helps.