My supplier's system sends me automated invoices by email, however, due to a glitch with their system, this email gets sent to me twice, a few hours apart. Since it is sent twice, my Gmail does not detect it as a duplicate, so it appears in my Gmail inbox twice. Both of the emails I receive have the same subject, message body and attachment.
I have a mail filter rule setup to forward these invoice emails to a 3rd party. Is there a way to stop the 3rd party from receiving the both identical copies of the invoice?
For example, is it possible to set filter conditions to only forward once per subject line (e.g., subject line must be unique).