Out of interest, I have a custom build of James running in production that does exactly this. As I
recall, I added a few lines to the doRCPT method of SMTPHandler.java to instantitate
JDBCVirtualUserTable and reject the recipient if not found in the table. Bandwidth usage dropped
significantly.
Obviously, I'm hoping that the in-protocol handler being developed will remove the need for a custom
build.
Craig
Noel J. Bergman wrote:
One of the major problems for mail administrators these days is the
incredibly high volume of dictionary attacks and spoofed sender addresses.
I have seen that you can get into block lists simply for sending DSN
responses. Therefore, I believe that we're going to need to support
in-protocol virtual user table translation, so that we can NAK the address
without needing to send a bounce.
--- Noel
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