Checking of the email address

src/freedombone-base-email

 # refresh gpg keys every few hours
 REFRESH_GPG_KEYS_HOURS=2
 
+function check_email_address_exists {
+    read_config_param ONION_ONLY
+    read_config_param MY_USERNAME
+    read_config_param DEFAULT_DOMAIN_NAME
+    read_config_param MY_EMAIL_ADDRESS
+    read_config_param DH_KEYLENGTH
+
+    if [ ! $MY_USERNAME ]; then
+        echo $'No username for email installation'
+        exit 73672
+    fi
+    if [ ! $DEFAULT_DOMAIN_NAME ]; then
+        echo $'No default domain name for email installation'
+        exit 57634
+    fi
+
+    my_email="$MY_EMAIL_ADDRESS"
+    if [ ${#my_email} -lt 3 ]; then
+        MY_EMAIL_ADDRESS=${MY_USERNAME}@${DEFAULT_DOMAIN_NAME}
+        write_config_param "MY_EMAIL_ADDRESS" "$MY_EMAIL_ADDRESS"
+    fi
+}
+
 function backup_email {
     echo ''
 }
     fi
     apt-get -yq install gnupg
 
+    check_email_address_exists
+
     gpg_dir=/home/$MY_USERNAME/.gnupg
 
     # if gpg keys directory was previously imported from usb
         return
     fi
 
-    read_config_param ONION_ONLY
-    read_config_param MY_USERNAME
-    read_config_param DEFAULT_DOMAIN_NAME
-    read_config_param MY_EMAIL_ADDRESS
-    read_config_param DH_KEYLENGTH
-
-    if [ ! $MY_USERNAME ]; then
-        echo $'No username for email installation'
-        exit 73672
-    fi
-    if [ ! $DEFAULT_DOMAIN_NAME ]; then
-        echo $'No default domain name for email installation'
-        exit 57634
-    fi
-
-    my_email="$MY_EMAIL_ADDRESS"
-    if [ ${#my_email} -lt 3 ]; then
-        MY_EMAIL_ADDRESS=${MY_USERNAME}@${DEFAULT_DOMAIN_NAME}
-        write_config_param "MY_EMAIL_ADDRESS" "$MY_EMAIL_ADDRESS"
-    fi
-
+    check_email_address_exists
     install_email_basic
     #install_email_with_tor