On Mon, 2010-01-25 at 13:58 +0100, Andreas Schulze wrote: > Hello, > > reading the wiki I found > http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy?highlight=(no DNS > resolving) > > I have a setup where the destination of a proxyconnection is an DNS name. > Is there a technical reason which currently require host= to be an IP address > ?
Yeah. DNS lookups are blocking, so whenever DNS server can't be reached, the lookups start hanging and admins start wondering why Dovecot is just hanging. Solutions would be: a) Assume "the hang never happens" and just do the blocking lookups. b) Get some async DNS library from somewhere. c) With v2.0 there could be a separate dns lookup processes that do blocking lookups, but since the caller processes would be doing async lookups they could report errors after a couple of seconds of waiting. Hmm. Actually I think I like c).
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