It would be helpful to see what VM error code is returned by the SMTP server in this situation. Open a Command Shell or Terminal window and enter the following where username:password is replaced with your email address and password, i.e. richard.branson@virginmedia.com:Y54kpX5g:
curl -v smtps://smtp.virginmedia.com -u username:password 2>&1 | (where findstr && (findstr "235 VM") || (grep "235\\|VM"))
Post the redacted results here.
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