Add notice of deprecation of sendmail (#4386)

Co-authored-by: Ewoud Kohl van Wijngaarden <[email protected]>
Co-authored-by: Lena Ansorgová <[email protected]>

Author: 3 people

guides/common/modules/proc_configuring-satellite-for-outgoing-emails.adoc

@@ -3,11 +3,15 @@
 [id="Configuring_Server_for_Outgoing_Emails_{context}"]
 = Configuring {ProjectServer} for outgoing emails
 
-To send email messages from {ProjectServer}, you can use either an SMTP server, or the `sendmail` command.
+To send email messages from {ProjectServer}, you can use an SMTP server or the `sendmail` command.
+
+:FeatureName: The `sendmail` command
+:FeatureAlternative: the SMTP service on {ProjectServer}
+include::snip_deprecated-feature.adoc[]
 
 .Prerequisites
-* Some SMTP servers with anti-spam protection or grey-listing features are known to cause problems.
-To setup outgoing email with such a service either install and configure a vanilla SMTP service on {ProjectServer} for relay or use the `sendmail` command instead.
+* Some SMTP servers with anti-spam protection or greylisting features are known to cause problems.
+To set up outgoing email with such a service, install and configure an SMTP service on {ProjectServer} for relay or use the `sendmail` command.
 
 .Procedure
 . In the {ProjectWebUI}, navigate to *Administer* > *Settings*.
@@ -60,8 +64,7 @@ endif::[]
 For more information see the *sendmail 1* man page.
 |Sendmail arguments | -i
 |====
-
-. If you decide to send email using an SMTP server which uses TLS authentication, also perform one of the following steps:
+. To send email by using an SMTP server that uses TLS authentication, also perform one of the following steps:
 +
 * Mark the CA certificate of the SMTP server as trusted.
 To do so, execute the following commands on {ProjectServer}: