Odd postfix LDAP behavior

[Quanah Gibson-Mount]

I noticed this the other day when debugging a self-inflicted issue with 
postfix and LDAP.  If postfix is configured to bind as user X, and user X 
doesn't exist in LDAP, LDAP will return error code 49 (invalid 
credentials).  This is of course the correct behavior on the LDAP side of 
things.  However, rather than postfix ending the connection to the LDAP 
server and deferring delivery, it instead continues to send various 
searches to the LDAP server, and eventually bounces the email.  This is 
behavior I found to be completely unexpected.  I would have instead 
expected it to queue the mail until it could make a successful connection 
to the LDAP Server and get valid delivery information.  I will try to get 
this set up again tomorrow so I can send some logs showing the postfix 
behavior.  Note this is with Postfix 2.8.5.

--Quanah
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Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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