I have a client that uses a Unifier from Cornerstone Communications (fax server) that communicates with their AS/400 (iseries, i) allowing them to fax or email spool files. They are not on a support contract because the cost is too high and they will not do an hourly support either.
Anyway a few days ago it stopped sending emails. When I look at the log the error it shows "SendMail failed: AUTH LOGIN failed. Response : 503 auth command used when not advertised"
This is running under Window XP Pro. There is a place in the software to enter the SMTP server, the user & password for SMTP authentication and the sending port. I have tried 3 different email accounts that are from different domains and I am still getting this. Plus theses are email accounts are being used from Outlook with no problems.
What I am trying to find out is:
1. What is this error caused from?
2. Is the problem more likely to be the computer and not the email accounts.