Adding clarity on how to enter the password

pages/common/msmtp.md

@@ -11,6 +11,6 @@
 
 `echo {{"Hello world"}} | msmtp --account={{account_name}} {{to@example.org}}`
 
-- Send an email without a configured account:
+- Send an email without a configured account. The password should be specified in the `~/.msmtprc` file:
 
 `echo {{"Hello world"}} | msmtp --host={{localhost}} --port={{999}} --from={{from@example.org}} {{to@example.org}}`