Looking for any ideas as to what may be causing this.
Since February we have one customer who is receiving 11-12 copies of the invoice when we send it to them. Previously it has been fine.
It is a memorised transaction and gets sent via File—>Send Forms. We send 150ish invoices per batch, as if we send more than that some invoices do not make it to the recipient.
This is what I have redceived from the customer when they looked at their end:-
I've looked through my mail logs - it appears that amazonses is resending multiple copies of your email. They all have the same Message-ID header, meaning that they're duplicates.
