Thanks. Since my post I noticed that this was only occurring on one of my MX's and that MX was the one I'd had LDAP aliasing enabled on for testing. After turning LDAP aliasing off the problem went away.
I don't quite understand why/how this would affect it?
I'm currently running Courier 0.43.1.20030903.
The additional logging was added in 0929.
Any suggestions? For now I've got LDAP aliasing turned off but I'm trying to migrate away from using .courier files to facilitate an online account management interface to the forwards.
Check that authldaprc is owned by the courier uid/gid, and is group readable.
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