How to rename attachment in Exim?

Question

Exim

Task:
If the letter contains an attachment with the exe extension (for example), rename it to an attachment with the same name but with the ex_ extension (for example).
For Postfix and sendmail there is this www.pc-tools.net/unix/renattach/, but for Exim there was none.
Unfortunately, you cannot change Exim to something else.

Answer 1

The philosophy of Exim does not suggest that the mailer should interfere with the content of messages. I think the only option is to use a different from the usual local_delivery transport with the transport_filter parameter for processing by any script / software, where the attachment will be renamed and Exim will receive a safe message for delivery. You can use just the utility at your link.