[exim] Check if LDAP server can be reached

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Author: Moritz Wilhelmy
To: exim-users
Subject: [exim] Check if LDAP server can be reached

On my setup, LDAP lookups happen through NSS. If the LDAP server goes
down, the lookup fails, and the mail gets permanently rejected. I'd like
to either reject it only temporarily or accept all messages if the LDAP
server is down/can't be reached and freeze them.

I tried a simple lookup like this
${if eq{\
    ${lookup ldap{ldaps:///ou=People,dc=bla?uid?sub?(uid=${quote_ldap:$local_part)}}}}\

However, if the LDAP server can't be reached, it "generates an error"
(as described in the specification). What is the correct way to handle
such an error? Am I trying to do something stupid?

Best regards,