diff --git a/in/public/network/index.rst b/in/public/network/index.rst
index 327e9de..a5647c0 100644
--- a/in/public/network/index.rst
+++ b/in/public/network/index.rst
@@ -8,4 +8,5 @@ Network
    curl/index
    hosts/index
    isc-dhcp-server/index
+   smtp/index
    unbound/index
diff --git a/in/public/network/smtp/index.rst b/in/public/network/smtp/index.rst
new file mode 100644
index 0000000..b534eac
--- /dev/null
+++ b/in/public/network/smtp/index.rst
@@ -0,0 +1,23 @@
+smtp
+====
+
+Email with attachment
+---------------------
+
+::
+
+ Content-Type: multipart/mixed; boundary=${separator}; charset="utf8"
+ From: first.last@sub.domain.tld
+ To: first.last@sub.domain.tld
+ Subject: Email subject
+ --${separator}
+ Content-Type: text/plain; charset="utf8"
+
+ Email body
+ --${separator}
+ Content-Disposition: attachment; filename="file name"
+ Content-Transfer-Encoding: base64
+ Content-Type: application/octet-stream
+
+ …
+ --${separator}--