diff --git a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/Dockerfile b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/Dockerfile
index 8369ce3..a19c434 100644
--- a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/Dockerfile
+++ b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11
+FROM alpine:3.13
 
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
@@ -14,8 +14,9 @@
   tini \
   tzdata \
   python3 \
-  && python3 -m pip install --upgrade pip \
-  && python3 -m pip install acme-tiny
+  py3-pip \
+  && pip3 install --upgrade pip \
+  && pip3 install acme-tiny
 
 COPY acme.sh /srv/acme.sh
 COPY functions.sh /srv/functions.sh
diff --git a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/acme.sh b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/acme.sh
index 5d5da1e..4f5cb80 100755
--- a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/acme.sh
+++ b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/acme.sh
@@ -155,6 +155,18 @@
   fi
   if [[ ! -f ${ACME_BASE}/acme/account.pem ]]; then
     log_f "Generating missing Lets Encrypt account key..."
+    if [[ ! -z ${ACME_CONTACT} ]]; then
+      if ! verify_email "${ACME_CONTACT}"; then
+        log_f "Invalid email address, will not start registration!"
+        sleep 365d
+        exec $(readlink -f "$0")
+      else
+        ACME_CONTACT_PARAMETER="--contact mailto:${ACME_CONTACT}"
+        log_f "Valid email address, using ${ACME_CONTACT} for registration"
+      fi
+    else
+      ACME_CONTACT_PARAMETER=""
+    fi
     openssl genrsa 4096 > ${ACME_BASE}/acme/account.pem
   else
     log_f "Using existing Lets Encrypt account key ${ACME_BASE}/acme/account.pem"
@@ -207,22 +219,9 @@
   IPV6=$(get_ipv6)
   log_f "OK: ${IPV4}, ${IPV6:-"0000:0000:0000:0000:0000:0000:0000:0000"}"
 
-  # Hard-fail on CAA errors for MAILCOW_HOSTNAME
-  MH_PARENT_DOMAIN=$(echo ${MAILCOW_HOSTNAME} | cut -d. -f2-)
-  MH_CAAS=( $(dig CAA ${MH_PARENT_DOMAIN} +short | sed -n 's/\d issue "\(.*\)"/\1/p') )
-  if [[ ! -z ${MH_CAAS} ]]; then
-    if [[ ${MH_CAAS[@]} =~ "letsencrypt.org" ]]; then
-      log_f "Validated CAA for parent domain ${MH_PARENT_DOMAIN}"
-    else
-      log_f "Skipping ACME validation: Lets Encrypt disallowed for ${MAILCOW_HOSTNAME} by CAA record, retrying in 1h..."
-      sleep 1h
-      exec $(readlink -f "$0")
-    fi
-  fi
-
   #########################################
   # IP and webroot challenge verification #
-  SQL_DOMAINS=$(mysql --socket=/var/run/mysqld/mysqld.sock -u ${DBUSER} -p${DBPASS} ${DBNAME} -e "SELECT domain FROM domain WHERE backupmx=0" -Bs)
+  SQL_DOMAINS=$(mysql --socket=/var/run/mysqld/mysqld.sock -u ${DBUSER} -p${DBPASS} ${DBNAME} -e "SELECT domain FROM domain WHERE backupmx=0 and active=1" -Bs)
   if [[ ! $? -eq 0 ]]; then
     log_f "Failed to read SQL domains, retrying in 1 minute..."
     sleep 1m
@@ -290,7 +289,7 @@
     VALIDATED_CERTIFICATES+=("${CERT_NAME}")
 
     # obtain server certificate if required
-    DOMAINS=${SERVER_SAN_VALIDATED[@]} /srv/obtain-certificate.sh rsa
+    ACME_CONTACT_PARAMETER=${ACME_CONTACT_PARAMETER} DOMAINS=${SERVER_SAN_VALIDATED[@]} /srv/obtain-certificate.sh rsa
     RETURN="$?"
     if [[ "$RETURN" == "0" ]]; then # 0 = cert created successfully
       CERT_AMOUNT_CHANGED=1
diff --git a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/functions.sh b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/functions.sh
index 454946d..183be01 100644
--- a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/functions.sh
+++ b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/functions.sh
@@ -16,6 +16,15 @@
   fi
 }
 
+verify_email(){
+  regex="^(([A-Za-z0-9]+((\.|\-|\_|\+)?[A-Za-z0-9]?)*[A-Za-z0-9]+)|[A-Za-z0-9]+)@(([A-Za-z0-9]+)+((\.|\-|\_)?([A-Za-z0-9]+)+)*)+\.([A-Za-z]{2,})+$"
+  if [[ $1 =~ ${regex} ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
 verify_hash_match(){
   CERT_HASH=$(openssl x509 -in "${1}" -noout -pubkey | openssl md5)
   KEY_HASH=$(openssl pkey -in "${2}" -pubout | openssl md5)
@@ -33,7 +42,7 @@
   local IPV4_SRCS=
   local TRY=
   IPV4_SRCS[0]="ip4.mailcow.email"
-  IPV4_SRCS[1]="ip4.korves.net"
+  IPV4_SRCS[1]="ip4.nevondo.com"
   until [[ ! -z ${IPV4} ]] || [[ ${TRY} -ge 10 ]]; do
     IPV4=$(curl --connect-timeout 3 -m 10 -L4s ${IPV4_SRCS[$RANDOM % ${#IPV4_SRCS[@]} ]} | grep -E "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$")
     [[ ! -z ${TRY} ]] && sleep 1
@@ -46,8 +55,8 @@
   local IPV6=
   local IPV6_SRCS=
   local TRY=
-  IPV6_SRCS[0]="ip6.korves.net"
-  IPV6_SRCS[1]="ip6.mailcow.email"
+  IPV6_SRCS[0]="ip6.mailcow.email"
+  IPV6_SRCS[1]="ip6.nevondo.com"
   until [[ ! -z ${IPV6} ]] || [[ ${TRY} -ge 10 ]]; do
     IPV6=$(curl --connect-timeout 3 -m 10 -L6s ${IPV6_SRCS[$RANDOM % ${#IPV6_SRCS[@]} ]} | grep "^\([0-9a-fA-F]\{0,4\}:\)\{1,7\}[0-9a-fA-F]\{0,4\}$")
     [[ ! -z ${TRY} ]] && sleep 1
@@ -60,6 +69,17 @@
     DOMAIN=$1
     A_DOMAIN=$(dig A ${DOMAIN} +short | tail -n 1)
     AAAA_DOMAIN=$(dig AAAA ${DOMAIN} +short | tail -n 1)
+    # Hard-fail on CAA errors for MAILCOW_HOSTNAME
+    PARENT_DOMAIN=$(echo ${DOMAIN} | cut -d. -f2-)
+    CAAS=( $(dig CAA ${PARENT_DOMAIN} +short | sed -n 's/\d issue "\(.*\)"/\1/p') )
+    if [[ ! -z ${CAAS} ]]; then
+      if [[ ${CAAS[@]} =~ "letsencrypt.org" ]]; then
+        log_f "Validated CAA for parent domain ${PARENT_DOMAIN}"
+      else
+        log_f "Lets Encrypt disallowed for ${PARENT_DOMAIN} by CAA record"
+        return 1
+      fi
+    fi
     # Check if CNAME without v6 enabled target
     if [[ ! -z ${AAAA_DOMAIN} ]] && [[ -z $(echo ${AAAA_DOMAIN} | grep "^\([0-9a-fA-F]\{0,4\}:\)\{1,7\}[0-9a-fA-F]\{0,4\}$") ]]; then
       AAAA_DOMAIN=
diff --git a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/obtain-certificate.sh b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/obtain-certificate.sh
index 8264a2c..a151dff 100644
--- a/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/obtain-certificate.sh
+++ b/mailcow/src/mailcow-dockerized/data/Dockerfiles/acme/obtain-certificate.sh
@@ -93,8 +93,8 @@
   sleep 2
 done
 log_f "Resolver OK"
-
-ACME_RESPONSE=$(acme-tiny ${DIRECTORY_URL} \
+log_f "Using command acme-tiny ${DIRECTORY_URL} ${ACME_CONTACT_PARAMETER} --account-key ${ACME_BASE}/acme/account.pem --disable-check --csr ${CSR} --acme-dir /var/www/acme/"
+ACME_RESPONSE=$(acme-tiny ${DIRECTORY_URL} ${ACME_CONTACT_PARAMETER} \
   --account-key ${ACME_BASE}/acme/account.pem \
   --disable-check \
   --csr ${CSR} \