To determine what, if any, error code is being returned by the SMTP server open a Terminal and enter the following commands:
export HISTCONTROL=ignorespace
curl -v smtps://smtp.virginmedia.com -u username:password 2>&1 | grep "235\|VM"
where username:password is replaced with your email address and password, for example richard.branson@virginmedia.com:Y54kpX5g
Post the result after making any necessary redactions here,
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