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diff --git a/src/configure.default b/src/configure.default
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index d1ce2f1..1f10008 100644
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--- a/src/configure.default
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+++ b/src/configure.default
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@@ -55,7 +55,7 @@
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 # +local_domains, +relay_to_domains, and +relay_from_hosts, respectively. They
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 # are all colon-separated lists:
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-domainlist local_domains = @
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+domainlist local_domains = @ : localhost : localhost.localdomain
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 domainlist relay_to_domains =
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 hostlist   relay_from_hosts = localhost
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 # (We rely upon hostname resolution working for localhost, because the default