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I think you can check your SMTP server with your system administrator firstly. does it work normally?
And if you are using a Windows PC for APEX, you can check you SMTP server in your IIS administration.
From your error info : Unable to relay, you can follow below to have a check, if you are working on MS Window
IIS -> Default SMTP Virtual Server -> Properties -> Access -> Relay resitrictions -> Relay -> All except the list below.
Hope this helpfull.