diff --git a/pkgs/development/libraries/libmilter/darwin.patch b/pkgs/development/libraries/libmilter/darwin.patch
index be46662d6b38..9bad640450c6 100644
--- a/pkgs/development/libraries/libmilter/darwin.patch
+++ b/pkgs/development/libraries/libmilter/darwin.patch
@@ -13,16 +13,16 @@ Fix build issues on Darwin.
  define(`confLDOPTS', `${Extra_LD_Flags}')
 --- a/sendmail/sendmail.h	2020-05-18 14:51:17.000000000 +0200
 +++ b/sendmail/sendmail.h	2020-05-18 14:51:00.000000000 +0200
-@@ -104,7 +104,11 @@
- # endif /* NETX25 */
+@@ -122,7 +122,11 @@
+ # endif
  
- # if NAMED_BIND
--#  include <arpa/nameser.h>
-+#  ifdef __APPLE__
-+#   include <arpa/nameser_compat.h>
-+#  else
-+#   include <arpa/nameser.h>
-+#  endif
- #  ifdef NOERROR
- #   undef NOERROR		/* avoid <sys/streams.h> conflict */
- #  endif /* NOERROR */
+ #if NAMED_BIND
+-# include <arpa/nameser.h>
++# ifdef __APPLE__
++#  include <arpa/nameser_compat.h>
++# else
++#  include <arpa/nameser.h>
++# endif
+ # ifdef NOERROR
+ #  undef NOERROR		/* avoid <sys/streams.h> conflict */
+ # endif
diff --git a/pkgs/development/libraries/libmilter/default.nix b/pkgs/development/libraries/libmilter/default.nix
index 38788b3c964b..ee92235adacc 100644
--- a/pkgs/development/libraries/libmilter/default.nix
+++ b/pkgs/development/libraries/libmilter/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "libmilter";
-  version = "8.15.2";
+  version = "8.17.1";
 
   src = fetchurl {
     url = "ftp://ftp.sendmail.org/pub/sendmail/sendmail.${version}.tar.gz";
-    sha256 = "0fdl9ndmspqspdlmghzxlaqk56j3yajk52d7jxcg21b7sxglpy94";
+    sha256 = "sha256-BLx2tsiG5tERvn/Y2qMrjOABKKKItrUuBnvCnzhUpuY=";
   };
 
   buildPhase = ''
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
     sh Build -f ./a.m4
   '';
 
-  patches = [ ./install.patch ./sharedlib.patch ./glibc-2.30.patch ./darwin.patch ];
+  patches = [ ./install.patch ./sharedlib.patch ./darwin.patch ];
 
   nativeBuildInputs = [ m4 ] ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
diff --git a/pkgs/development/libraries/libmilter/glibc-2.30.patch b/pkgs/development/libraries/libmilter/glibc-2.30.patch
deleted file mode 100644
index e72ec9911e37..000000000000
--- a/pkgs/development/libraries/libmilter/glibc-2.30.patch
+++ /dev/null
@@ -1,44 +0,0 @@
-diff --git a/libmilter/sm_gethost.c b/libmilter/sm_gethost.c
-index 2423c34..f00468c 100644
---- a/libmilter/sm_gethost.c
-+++ b/libmilter/sm_gethost.c
-@@ -52,16 +52,8 @@ sm_getipnodebyname(name, family, flags, err)
- 	bool resv6 = true;
- 	struct hostent *h;
- 
--	if (family == AF_INET6)
--	{
--		/* From RFC2133, section 6.1 */
--		resv6 = bitset(RES_USE_INET6, _res.options);
--		_res.options |= RES_USE_INET6;
--	}
- 	SM_SET_H_ERRNO(0);
--	h = gethostbyname(name);
--	if (family == AF_INET6 && !resv6)
--		_res.options &= ~RES_USE_INET6;
-+	h = gethostbyname2(name, family);
- 
- 	/* the function is supposed to return only the requested family */
- 	if (h != NULL && h->h_addrtype != family)
-diff --git a/sendmail/conf.c b/sendmail/conf.c
-index c73334e..500dafb 100644
---- a/sendmail/conf.c
-+++ b/sendmail/conf.c
-@@ -4243,16 +4243,8 @@ sm_getipnodebyname(name, family, flags, err)
- # else /* HAS_GETHOSTBYNAME2 */
- 	bool resv6 = true;
- 
--	if (family == AF_INET6)
--	{
--		/* From RFC2133, section 6.1 */
--		resv6 = bitset(RES_USE_INET6, _res.options);
--		_res.options |= RES_USE_INET6;
--	}
- 	SM_SET_H_ERRNO(0);
--	h = gethostbyname(name);
--	if (!resv6)
--		_res.options &= ~RES_USE_INET6;
-+	h = gethostbyname2(name, family);
- 
- 	/* the function is supposed to return only the requested family */
- 	if (h != NULL && h->h_addrtype != family)