[Dovecot] tcp_wrappers

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Hi,

I've just started using Dovecot (v1.1.14), and I'm noticing a lot of dictionary
attacks. I searched through the documentation and the mailing list archives
hoping to find support for tcp_wrappers (hosts.deny) support. 

I did find some suggested patches in the list from last year, but as far
as I can tell, there is no support in the released versions.

Is this implemented and undocumented, or just unimplemented? I would be
surprised to find it unimplemented in such an otherwise sophisticated project.

Thanks in advance,
--Bill