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--- sendmail-8.13.1/cf/m4/proto.m4.localdomain	2007-01-22 16:35:19.000000000 +0100
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+++ sendmail-8.13.1/cf/m4/proto.m4	2007-01-22 16:36:47.000000000 +0100
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@@ -1840,6 +1840,8 @@
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 			$: < ? $&{client_name} > < $1 @ [127.0.0.1] >
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 R<@> < $* @ localhost.$m >
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 			$: < ? $&{client_name} > < $1 @ localhost.$m >
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+R<@> < $* @ localhost.localdomain >
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+			$: < ? $&{client_name} > < $1 @ localhost.localdomain >
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 ifdef(`_NO_UUCP_', `dnl',
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 `R<@> < $* @ localhost.UUCP >
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 			$: < ? $&{client_name} > < $1 @ localhost.UUCP >')