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Many mail and IRC servers, when connected to, use the "ident" protocol to try
to find out the owner of the incoming connection, and don't respond to the
incoming connection until they have tried "ident". This problem shows up,
for example, as delays when connecting to mail servers. The connection will
be made with the mail server, but there will be a noticeable delay before any
mail is retrieved. This is because the server tries to make an "ident"
connection back, but has wait and time out before realising that it won't
work. The solution is to just make sure that "ident" is being rejected for
connections coming from the zone containing the mail server.
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