Hi, I have a very strange error getting logged every time a page (any page) is open in the forum. It looks like the app is trying to send an email to an invalid address every time anyone clicks anything in the forum.

The error is:
System.Net.Mail.SmtpException: Mailbox name not allowed. The server response was: sorry, your mail was administratively denied. (#5.7.1) at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at yaf.pages.ForumPage.SendMailThread()

YAF Version: 1.9.1.7, host godaddy.

Thank you very much in advance.

Just noticed same thing on my site last night.
I was using a gmail account and was throwing the error.
re-set up a godaddy email account and is working fine know.
just reset the email in host settings to one from my domain and
everything was back to normal.
HTH