I have a user who's emails are randomly rejected, with admin receiving this message:
Message could not be delivered to the following recipient:
<Username>@tdl.com.au
because: Recipient name not found at destination
Reporting-MTA: smtp; mail.tdl.com.au
DSN-Gateway: dns; mail.tdl.com.au
Final-Recipient: rfc822;<Username>@tdl.com.au
Action: failed
Status: 5.1.1
x-scalix-Reason-Code: 100
I forward the message to the user, and it works. I have noticed that this has happened at least 5 times in 3 days. I have checked and double checked that the address is correct. Any ideas?