system
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The pop up error message was that the Server thought is was a suspicious message. I only just found out it was Avast and not my email provider because Avast sent me an email telling me it had blocked the email.
The problem has been driving me crazy for quite some time and I was naturally blaming the ‘server’.
However I found a setting in Avast (Under 'Mail Shield/Settings) to turn off mail checking and now I can send the exe file so at last the problem has been flushed down the cyber sewer.
Thanks for trying to help.