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diff --git a/sendmail/conf.c b/sendmail/conf.c
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index 63c545c..e9fa42c 100644
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--- a/sendmail/conf.c
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+++ b/sendmail/conf.c
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@@ -1039,7 +1039,7 @@ switch_map_find(service, maptype, mapreturn)
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 				if (p != NULL)
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 					*p = '\0';
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 #ifndef SM_NSSWITCH_DELIMS
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-# define SM_NSSWITCH_DELIMS	" \t"
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+# define SM_NSSWITCH_DELIMS	" \t:"
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 #endif
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 				p = strpbrk(buf, SM_NSSWITCH_DELIMS);
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 				if (p != NULL)