> [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".
Wow, thanks a lot, it solved my problem ! I did not find this config line in the documentation (probably because I searched wrong keywords as I did not know Postfix considered these relays as unreachable) and help on IRC yielded not success. Thank you for your kind help. J.-S.
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