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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...InnerException: Unable to send to a recipient.InnerException: Unable to send to a recipient.
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1/14/2016 12:24 PM
 

Message: System.Net.Mail.SmtpFailedRecipientsException: Unable to send to a recipient. ---> System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Unable to relay --- End of inner exception stack trace --- 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)

I've been able to send out an email whenever a user completes the form. All of sudden, this errors occur. Emails can be received internally, but when a users enter an email from outside (gmail, outlook, etc...), this occurs. Does anyone seem to know the problem?

 
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1/14/2016 12:32 PM
 

Based on the error.  I would start by reading this...  It could the the SMTP server configuration.

http://stackoverflow.com/questions/3165721/mailbox-unavailable-the-server-response-was-5-7-1-unable-to-relay-for-abcxyz

 
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1/14/2016 1:14 PM
Accepted Answer 

Solved the problem. IP changed.

 
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