DNN 9.0.1. & 9.0.0   fails to send email messages. One test mail is sent OK, but the system halts on next one. If you give the admin password again, you can send again ONE test mail. Randomly also messages from one user to other are sent but NEVER ANY Administrative emails.

Anyone knows how to tame this one?

AbsoluteURL:/Default.aspx

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:0b481c91-3d1c-48b7-85b6-1004a84557a2

AssemblyVersion:

PortalId:-1

UserId:-1

TabId:-1

RawUrl:

Referrer:

UserAgent:

ExceptionHash:1HxUBR3ZK1jGjfnVUfFQWHlmB54=

Message:Transaction failed. The server response was: 5.7.1 <jarmo@juhlakauha.com style="margin: 0px; padding: 0px; box-sizing: border-box; word-break: break-all; word-wrap: break-word;">: Relay access denied</jarmo@juhlakauha.com>

StackTrace:

at System.Net.Mail.RecipientCommand.CheckResponse(SmtpStatusCode statusCode, String response) 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)