diff --git a/en_US/installation/0-install.iredmail.on.debian.ubuntu.md b/en_US/installation/0-install.iredmail.on.debian.ubuntu.md
index 22a06539..4ad2a25b 100644
--- a/en_US/installation/0-install.iredmail.on.debian.ubuntu.md
+++ b/en_US/installation/0-install.iredmail.on.debian.ubuntu.md
@@ -30,7 +30,7 @@
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
To install iRedMail on Debian or Ubuntu Linux, you need:
diff --git a/en_US/installation/0-install.iredmail.on.freebsd.md b/en_US/installation/0-install.iredmail.on.freebsd.md
index 6d2a775b..7abe49f0 100644
--- a/en_US/installation/0-install.iredmail.on.freebsd.md
+++ b/en_US/installation/0-install.iredmail.on.freebsd.md
@@ -26,7 +26,7 @@
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
To install iRedMail on FreeBSD, you need:
diff --git a/en_US/installation/0-install.iredmail.on.freebsd.with.jail.md b/en_US/installation/0-install.iredmail.on.freebsd.with.jail.md
index f6bb7609..59a7c136 100644
--- a/en_US/installation/0-install.iredmail.on.freebsd.with.jail.md
+++ b/en_US/installation/0-install.iredmail.on.freebsd.with.jail.md
@@ -37,7 +37,7 @@ Notes:
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
* The latest stable release of iRedMail. You can download it here:
* Port `sysutils/ezjail` for FreeBSD.
diff --git a/en_US/installation/0-install.iredmail.on.openbsd.md b/en_US/installation/0-install.iredmail.on.openbsd.md
index 620ee204..73b9da2b 100644
--- a/en_US/installation/0-install.iredmail.on.openbsd.md
+++ b/en_US/installation/0-install.iredmail.on.openbsd.md
@@ -30,7 +30,7 @@
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
To install iRedMail on OpenBSD, you need:
diff --git a/en_US/installation/0-install.iredmail.on.rhel.md b/en_US/installation/0-install.iredmail.on.rhel.md
index d142d1e7..7da08e1f 100644
--- a/en_US/installation/0-install.iredmail.on.rhel.md
+++ b/en_US/installation/0-install.iredmail.on.rhel.md
@@ -30,7 +30,7 @@
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
To install iRedMail on RHEL or CentOS Linux, you need:
diff --git a/en_US/iredmail-easy/1-iredmail-easy.getting.start.md b/en_US/iredmail-easy/1-iredmail-easy.getting.start.md
index 09d31f2b..40c314f9 100644
--- a/en_US/iredmail-easy/1-iredmail-easy.getting.start.md
+++ b/en_US/iredmail-easy/1-iredmail-easy.getting.start.md
@@ -45,7 +45,7 @@ installation guides here: [Install iRedMail](./index.html#install).
- Microsoft Azure.
- Linode. Explained in the [blog post](https://www.linode.com/blog/linode/a-new-policy-to-help-fight-spam/),
you can open a support ticket to request the Linode team to open it.
- - DigitalOcean.
+ - DigitalOcean. According to [a post in their community](https://www.digitalocean.com/community/questions/port-25-465-is-blocked-how-can-i-enable-it), __SEEMS__ impossible to unblock port 25, that means you can __NOT__ run mail server on DigitalOcean VPS.
### Supported Linux and BSD distribution releases
diff --git a/html/install.iredmail.on.debian.ubuntu.html b/html/install.iredmail.on.debian.ubuntu.html
index abb67f0a..b11c54b5 100644
--- a/html/install.iredmail.on.debian.ubuntu.html
+++ b/html/install.iredmail.on.debian.ubuntu.html
@@ -67,7 +67,7 @@ is available through the ticket system.
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.
diff --git a/html/install.iredmail.on.freebsd.html b/html/install.iredmail.on.freebsd.html
index 2457d2da..7e96d5fc 100644
--- a/html/install.iredmail.on.freebsd.html
+++ b/html/install.iredmail.on.freebsd.html
@@ -62,7 +62,7 @@ this installation guide instead:
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.
diff --git a/html/install.iredmail.on.freebsd.with.jail.html b/html/install.iredmail.on.freebsd.with.jail.html
index d3f4c211..52d873fc 100644
--- a/html/install.iredmail.on.freebsd.with.jail.html
+++ b/html/install.iredmail.on.freebsd.with.jail.html
@@ -77,7 +77,7 @@
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.
diff --git a/html/install.iredmail.on.openbsd.html b/html/install.iredmail.on.openbsd.html
index 02f02e67..601c962f 100644
--- a/html/install.iredmail.on.openbsd.html
+++ b/html/install.iredmail.on.openbsd.html
@@ -64,7 +64,7 @@ is available through the ticket system.
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.
diff --git a/html/install.iredmail.on.rhel.html b/html/install.iredmail.on.rhel.html
index e6c9f422..2ee0ad15 100644
--- a/html/install.iredmail.on.rhel.html
+++ b/html/install.iredmail.on.rhel.html
@@ -68,7 +68,7 @@ is available through the ticket system.
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.
diff --git a/html/iredmail-easy.getting.start.html b/html/iredmail-easy.getting.start.html
index c98fb0c1..6f3118de 100644
--- a/html/iredmail-easy.getting.start.html
+++ b/html/iredmail-easy.getting.start.html
@@ -81,7 +81,7 @@ installation guides here: Install iRedMail.
Microsoft Azure.
Linode. Explained in the blog post,
you can open a support ticket to request the Linode team to open it.
-DigitalOcean.
+DigitalOcean. According to a post in their community, SEEMS impossible to unblock port 25, that means you can NOT run mail server on DigitalOcean VPS.