diff --git a/docs/content/a-mail-server's-101.md b/docs/content/a-mail-server's-101.md
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--- a/docs/content/a-mail-server's-101.md
+++ b/docs/content/a-mail-server's-101.md
@@ -3,7 +3,7 @@ Here's an introduction to the field that covers everything you need to know to g
 
 ## Anatomy of a mail server
 
-A mail server is only a part of a [client-server relationship](https://en.wikipedia.org/wiki/Client%E2%80%93server_model) aimed at exchanging information in the form of emails.
+A mail server is only a part of a [client-server relationship](https://en.wikipedia.org/wiki/Client%E2%80%93server_model) aimed at exchanging information in the form of emails. Exchanging emails requires using specific means (programs and protocols).
 
 This project provides with the server portion, whereas "the" client can be anything from a console, text-only software (eg. [Mutt](https://en.wikipedia.org/wiki/Mutt_(email_client))) to a fully-fledged desktop application (eg. [Mozilla Thunderbird](https://en.wikipedia.org/wiki/Mozilla_Thunderbird), [Microsoft Outlook](https://en.wikipedia.org/wiki/Microsoft_Outlook)…), to a webmail, etc.