Hi John
Could you send me an Ethereal recording of the network activity when sending your email?
Note that even with authentication enabled your user name and password are quite easily decrypted from the data so it may be best to temporarily change these for the recording.
As far as I am aware, the only way that the SMTP_SUCCESS event can be signalled is when the connection closes corretly after doing all work and I have not heard of it reproting it after an error had occurred - in any case I would expect a specific error to be reported previously if the SMTP process were interrupted or failed.
Of course the sending of an email doesn't guarantee its delieverd. The delivery can only be confirmed by the receiver so you may find that there is some reason why the email is being rejected somewhere in the delivery process.
From an Ethereal recording we can confirm all internal workings easily and then take next steps in finding out why you have these difficulties.
Regards
Mark