I have not tested it, still using smtp-sink from postfix tools but there is Mailpit [1] which may fit your needs assuming that you BCC each account from the sen

I have not tested it, still using smtp-sink from postfix tools but there is Mailpit [1] which may fit your needs assuming that you BCC each account from the sending address to accomplish the "Sent" aspect of your requirements. meaning people would see what you sent and then the responses. [1] - https://github.com/axllent/mailpit https://github.com/axllent/mailpit