Emails still being sent to suppliers with Override Email address set in Notification Mailer

An issue has arisen from an inquiry onto the remittance advice emails.  is seems that these emails are not going via the mailer but are going direct, and therefore bypassing the email override address set in the Workflow notification mailer.

A user received a direct email by putting his email in the suppliers remittance email address, which means that there is potential we have been emailing real suppliers  from a test environment. and we do not want this to occur. I will continue to research but I certainly look forward to some advice.

Regards,

Melinda