Daniel Bromberg:
> Just to source it:
>
> [snapshot-20000507] For the sake of Sendmail compatibility, the
> Postfix SMTP client skips over SMTP servers that greet with a 4XX
> or 5XX reply code, treating them as unreachable servers. To obtain
> prior behavior (4XX=retry, 5XX=bounce), specify "smtp_skip_4xx_greeting
> = no" and "smtp_skip_5xx_greeting = no".
The rationale is that some people actually expect that a 5XX reply
on CONNECT means the client should connect to the a backup server
instead.
Keep in mind that the primary purpose of Postfix is to deliver
mail, not to force people to configure the server per the RFC.
Wietse
