Add a note with command for queuing test email in exim

1 files changed, 12 insertions, 0 deletions

diff --git a/README.md b/README.md
index 68e5ba0..e737047 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,18 @@ container service.
 Feel free to look into the `Makefile` to see what other helpful targets are
 available.
 
+## Notes
+
+After entering the server container, a sample email can be sent with
+
+```shell
+(echo "To: foo@bar";
+   echo "Reply-To: my@email.com"
+   echo "Subject: Hello!";
+   echo "";
+   echo "My Mail Content") | exim koszko@koszko.org
+```
+
 ## Copying
 
 The configuration as a whole is available under GPL-2.0-or-later.