Unable to use print management to send invoice as pdf

Hi all,

I would like to send automatically via email a pdf invoice to my customers.

I setup Print management to be able to print and send an invoice as a PDF to a customer. However when trying to post the invoice , the system fails to do so. what do i missing?

error Message is here: No connection could be made because the target machine actively refused it 127.0.0.1:25

any help will be appreciated

tks

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