diff --git a/tests/data/test1034 b/tests/data/test1034
index d80e35e6f7..d926e82ba7 100644
--- a/tests/data/test1034
+++ b/tests/data/test1034
@@ -29,7 +29,7 @@ proxy
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test1035 b/tests/data/test1035
index 3b7156e106..fc5f1c28f2 100644
--- a/tests/data/test1035
+++ b/tests/data/test1035
@@ -27,7 +27,7 @@ proxy
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test1448 b/tests/data/test1448
index ea35689da0..96d64b85a5 100644
--- a/tests/data/test1448
+++ b/tests/data/test1448
@@ -43,7 +43,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test1560 b/tests/data/test1560
index 46b0607dcc..42da17176d 100644
--- a/tests/data/test1560
+++ b/tests/data/test1560
@@ -13,7 +13,7 @@ urlapi
 none
 </server>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <features>
diff --git a/tests/data/test165 b/tests/data/test165
index 7444f88838..0b5cfd2346 100644
--- a/tests/data/test165
+++ b/tests/data/test165
@@ -33,7 +33,7 @@ proxy
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test2046 b/tests/data/test2046
index 66b852c5e5..cf25d0c57b 100644
--- a/tests/data/test2046
+++ b/tests/data/test2046
@@ -43,7 +43,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test2047 b/tests/data/test2047
index b04cbc14be..c32e6aabc7 100644
--- a/tests/data/test2047
+++ b/tests/data/test2047
@@ -44,7 +44,7 @@ proxy
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test955 b/tests/data/test955
index 055275d704..817b47a67e 100644
--- a/tests/data/test955
+++ b/tests/data/test955
@@ -24,7 +24,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test956 b/tests/data/test956
index d0507de939..4546f2ee61 100644
--- a/tests/data/test956
+++ b/tests/data/test956
@@ -21,7 +21,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test957 b/tests/data/test957
index 569b779ab9..9548627b98 100644
--- a/tests/data/test957
+++ b/tests/data/test957
@@ -22,7 +22,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test958 b/tests/data/test958
index f09cc78d80..f1006a0a66 100644
--- a/tests/data/test958
+++ b/tests/data/test958
@@ -22,7 +22,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test959 b/tests/data/test959
index 516c876d97..2154600da2 100644
--- a/tests/data/test959
+++ b/tests/data/test959
@@ -25,7 +25,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test960 b/tests/data/test960
index 92d99125fe..fb50a326b2 100644
--- a/tests/data/test960
+++ b/tests/data/test960
@@ -22,7 +22,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test961 b/tests/data/test961
index 0199624d30..2068d8fc84 100644
--- a/tests/data/test961
+++ b/tests/data/test961
@@ -23,7 +23,7 @@ smtp
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test962 b/tests/data/test962
index d60d54a443..80292862ba 100644
--- a/tests/data/test962
+++ b/tests/data/test962
@@ -23,8 +23,8 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL=
-LC_CTYPE=C.UTF-8
+LC_ALL=en_US.UTF-8
+LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
 SMTP without SMTPUTF8 support - UTF-8 based sender (host part only)
diff --git a/tests/data/test964 b/tests/data/test964
index 95ee6b77d8..12c312eccd 100644
--- a/tests/data/test964
+++ b/tests/data/test964
@@ -24,7 +24,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test965 b/tests/data/test965
index 94e8d40ea6..0d29c09849 100644
--- a/tests/data/test965
+++ b/tests/data/test965
@@ -26,7 +26,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test966 b/tests/data/test966
index 58647e5f7f..b642e19a9d 100644
--- a/tests/data/test966
+++ b/tests/data/test966
@@ -26,7 +26,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test967 b/tests/data/test967
index 48a5bb67b5..f6e2e32382 100644
--- a/tests/data/test967
+++ b/tests/data/test967
@@ -30,7 +30,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>
diff --git a/tests/data/test968 b/tests/data/test968
index 35dce64955..8532c35e7d 100644
--- a/tests/data/test968
+++ b/tests/data/test968
@@ -27,7 +27,7 @@ IDN
 codeset-utf8
 </features>
 <setenv>
-LC_ALL
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <name>