rblsmtpd error codes

[D. J. Bernstein]

Sam writes:
> Is it only my opinion that rblsmtpd returns a temporary error code,
> for no good reason, so that the blacklisted relay keeps banging at
> your server for two weeks, until the mail bounces? 

It's not an opinion. It's a statement of fact. And it's wrong.

rblsmtpd gives you the choice between code 553, telling legitimate
clients to bounce the message immediately, and code 451, giving innocent
relay operators a chance to fix the problem. Read the fucking manual.

---Dan