[Mimedefang] adding promotional banner to top of email

[Mark Coetser]

Hi

I know html email is not ideal but unfortunately most customers use it 
now days. I am currently using append_html_boilerplate to add signatures 
etc and now a client has requested that we add promotional banners to 
the top of all html emails. I have searched and just cant find anything 
that relates to doing this with mimedefang, any pointers please?

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Thank you,