email error - smtpFailedRecipientException

[rbharris]

I am using system.net.mail and don't quite understand the process of emailing. I have set the server to the company email server and can email fine within the company but if I try to email to an address outside the company I get the following error:

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 for rob_b_harris1@hotmail.com
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at FileWatcher.email.sendMail(String serverName, String recipient, String recip2, String recip3, String from, String bcc, String cc, Int32 priority, String subject, String body, Boolean doAuthentication, Boolean doCheckServer, String userName, String Password) in C:\Documents and Settings\rbharris\My Documents\Visual Studio 2005\Projects\FileWatcher\FileWatcher\email.vb:line 61

 

[zekeman]

On some servers, outgoing mail program needs to be set up if not loaded.

Its been awhile. I've configured some Linux servers and I know for sure

there are two programs, one for outgoing and one for incomming.

gosh its been too long ago now. - This may not help much.

 

[rbharris]

Email authentication

The problem was that I didn't include authentication credentials in my code.