diff --git a/html/install.iredmail.with.remote.mysql.server.html b/html/install.iredmail.with.remote.mysql.server.html
index a4b891a9..03b17314 100644
--- a/html/install.iredmail.with.remote.mysql.server.html
+++ b/html/install.iredmail.with.remote.mysql.server.html
@@ -88,18 +88,21 @@ address 192.168.1.200
with password admin_password
.
If you tried to install iRedMail with this remote MySQL server before, please -drop existing databases and MySQL users which will be created by iRedMail on -remote MySQL server:
+backup existing databases on remote MySQL server first, then drop them and +delete related MySQL users, because they will be created by iRedMail +automatically on remote MySQL server:mysql> DROP DATABASE amavisd;
mysql> DROP DATABASE cluebringer;
mysql> DROP DATABASE iredadmin;
mysql> DROP DATABASE roundcubemail;
+mysql> DROP DATABASE sogo;
mysql> DROP DATABASE vmail;
mysql> DROP USER 'amavisd'@'192.168.1.200';
mysql> DROP USER 'cluebringer'@'192.168.1.200';
mysql> DROP USER 'iredadmin'@'192.168.1.200';
mysql> DROP USER 'roundcube'@'192.168.1.200';
+mysql> DROP USER 'sogo'@'192.168.1.200';
mysql> DROP USER 'vmail'@'192.168.1.200';
mysql> DROP USER 'vmailadmin'@'192.168.1.200';
diff --git a/installation/install.iredmail.with.remote.mysql.server.md b/installation/install.iredmail.with.remote.mysql.server.md
index facc9464..ecb400b0 100644
--- a/installation/install.iredmail.with.remote.mysql.server.md
+++ b/installation/install.iredmail.with.remote.mysql.server.md
@@ -72,20 +72,23 @@ __Notes__:
be used anymore. We will give you SQL command to delete it later.
If you tried to install iRedMail with this remote MySQL server before, please
-drop existing databases and MySQL users which will be created by iRedMail on
-remote MySQL server:
+backup existing databases __on remote MySQL server first__, then drop them and
+delete related MySQL users, because they will be created by iRedMail
+automatically on remote MySQL server:
```
mysql> DROP DATABASE amavisd;
mysql> DROP DATABASE cluebringer;
mysql> DROP DATABASE iredadmin;
mysql> DROP DATABASE roundcubemail;
+mysql> DROP DATABASE sogo;
mysql> DROP DATABASE vmail;
mysql> DROP USER 'amavisd'@'192.168.1.200';
mysql> DROP USER 'cluebringer'@'192.168.1.200';
mysql> DROP USER 'iredadmin'@'192.168.1.200';
mysql> DROP USER 'roundcube'@'192.168.1.200';
+mysql> DROP USER 'sogo'@'192.168.1.200';
mysql> DROP USER 'vmail'@'192.168.1.200';
mysql> DROP USER 'vmailadmin'@'192.168.1.200';
```