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Re: SMTP traffic control

2011-10-29 19:21:34

Paul Smith <paul(_at_)pscs(_dot_)co(_dot_)uk> writes:

(I suspect the server is giving a 4yz because it is doing call-forward
testing whether the remote recipient exists, and gets no response either
from a DNS server or mail server for that address)

I believe Postfix returns those sorts of 4yx errors when configured to use
LDAP-based alias lookup and the LDAP server is not responding.

Russ Allbery (rra(_at_)stanford(_dot_)edu)             

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