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I have a about 12 domains running on a 8.4 Server. All working fine for last 2+ years.
Out of the blue, on 1 domain, we are getting Authentication failed on POP and SMTP using Outlook etc - just this 1 domain
Have triple/quadruple checked credentials. Can log in via Webmail, no problem.
Have tried recreating the domain, problem remains
Out of ideas - any input is welcomed