Howdy, folks.  I have a strange situation where the validation email sent out to new users only works if the user has an email address on the web site's server.  If I set up a regular or forwarding account, the email gets delivered.  If not, the event shown below is created.

Is this something I've missed in the DNN settings or something on the server?  I can't find anything else to change.

AssemblyVersion:7.1.2

PortalID:0

PortalName:Kuykendahl Gran Brewers

UserID:-1

UserName:

ActiveTabID:57

ActiveTabName:Home

RawURL:/Register?returnurl=http%253a%252f%252fkgbhomebrewclub.org%252f&popUp=true

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://kgbhomebrewclub.org/Register?returnurl=http%253a%252f%252fkgbhomebrewclub.org%252f&popUp=true

UserAgent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:9ec096e9-8221-4123-bff8-aa9e66ce410b

InnerException:Mailbox unavailable. The server response was: <faker@fakedomain.com> No such user here

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:System.Net.Mail.SmtpTransport.SendMail

StackTrace:

Message:

System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: <faker@fakedomain.com> No such user here at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at DotNetNuke.Services.Mail.Mail.SendMailInternal(MailMessage mailMessage, String subject, String body, MailPriority priority, MailFormat bodyFormat, Encoding bodyEncoding, IEnumerable`1 attachments, String smtpServer, String smtpAuthentication, String smtpUsername, String smtpPassword, Boolean smtpEnableSSL)

Source:

Server Name: PSS22

Thank you, Cathal Connolly.

I contacted my hosting service.  They told me I hadn't set up the SMTP settings properly, which was half right.  Once I'd done what they said (gone back to BASIC authentication with valid username), it still didn't work.  I had created a "donotreply" address without a mailbox.  On a hunch, I gave the account a 1KB mailbox and validation emails were sent after that.

Mark