Hi, I had lot of problems with open-smtp lock system. With 4000-5000 ip in open-smtp file, server was very slow. I change it to the same system but working with directory. There is no more problem with lock and servers are very fast.
Patch (vpopmail.c) and some docs are on ftp://ftp.ovh.net/made-in-ovh/vpopmail It is very easy (easier than before). Regards Octave