I have two installations, test environment and production environment, both with 7.04.02. In production environemnt, I cannot send email with async mode (in newsletter module), while in test environment I have no issues. Sync mode works in both cases.
The error I got is this:
Message:Mailbox unavailable. The server response was: 5.1.1 : Recipient address rejected: User unknown in local recipient table
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)
Do you have a solution? Is it a known issue? The server smtp used is different, but I cannot believe that it is the cause of my issue....