This is a rather urgent request.
We are using SBS2011 in house with Exchange 2010.
From early this morning - around 4.30am we stopped recieveing all email and we are not sure why. The server did do an update and restart itself last night - but we have removed that update but the issue is not resolved.
Internal email is being routed fine.
If a client emails us they get a bounce message - as follows:
< mk-filter-3-a-3.mail.uk.tiscali.com #5.0.0 smtp; 5.1.0 - Unknown address error 550-'5.7.1 Unable to relay for andy@XXXXX.co.uk' (delivery attempts: 0)>
If we run a 'testexchangeconnectivity' - Testing inbound SMTP mail flow for domain email@example.com - we get the following:
The server returned status code 550 - Mailbox unavailable. The server response was: 5.7.1 Unable to relay for andy@XXXXX.co.uk
Message: Mailbox unavailable. The server response was: 5.7.1 Unable to relay for andy@XXXXX.co.uk
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
Can anyone please throw any light on this issue as it is clippling us at the moment.
Thank you all