On Fri Oct 4, 2024 at 7:05 PM JST, Mark Lawrence wrote: > There is usually an option somewhere in list software to prefix Subject > lines with an identifier, like I've done for this email.
Changing the Subject header breaks the DKIM signature, so to be compatible with DKIM (which is required by most large mailservers nowadays) list software must keep the subject line intact. Alternatively, I've seen list software rewrite the From header to a list-controlled address, to then strip the original DKIM signature and add its own, but that makes for a poor user experience. Kindly, Lillian
