diff --git a/create_master_zone_file.sh b/create_master_zone_file.sh
index f4220bc..617e847 100755
--- a/create_master_zone_file.sh
+++ b/create_master_zone_file.sh
@@ -740,7 +740,7 @@ EOF
 ;
 ; TXT (u.a. SPF)
 ;
-@               3600 IN TXT   "v=spf1 a mx mx:lists.warenform.de mx:lists.oopen.de mx:lists.initiativenserver.de mx:listi.jpberlin.de ~all"
+@               3600 IN TXT   "v=spf1 a mx a:lists.warenform.de a:lists.oopen.de a:lists.initiativenserver.de a:listi.jpberlin.de ~all"
 
 ;
 ; DMARC
@@ -759,7 +759,7 @@ elif [[ -n "${DEFAULT_MX_HOST_1}" ]] ; then
 ;
 ; TXT (u.a. SPF)
 ;
-;@               3600 IN TXT   "v=spf1 a mx mx:lists.warenform.de mx:lists.oopen.de mx:lists.initiativenserver.de mx:listi.jpberlin.de ~all"
+;@               3600 IN TXT   "v=spf1 a mx a:lists.warenform.de a:lists.oopen.de a:lists.initiativenserver.de a:listi.jpberlin.de ~all"
 
 ;
 ; DMARC