My POP3 connector is picking up mails correctly, but seems to reject the mails at the point of transferring them to the recipient. I have turned on full logging and event log is showing:
Event ID: 4032
The recipient has been processed
NDR Status 502
Error code: 000000000
SMTP Reply: 4126.96.36.199 Client was not authenticated
All has been OK until yesterday. I did make changes to the SMTP default virtual server authentication on basic to enable default domains as our domain, and did this also to the other protocols, but have removed again this morning but still no difference. I must have done something else to cause the problem but cannot for the life of me think what!!
Any help gratefully accepted.