diff --git a/.markdownlint.yml b/.markdownlint.yml
index fe0d5c135636c047b4711bcb1ab5803326e02c08_Lm1hcmtkb3dubGludC55bWw=..3e5c825ea56720fced9f8c02c779d6a4d2624da2_Lm1hcmtkb3dubGludC55bWw= 100644
--- a/.markdownlint.yml
+++ b/.markdownlint.yml
@@ -103,6 +103,7 @@
     "OpenID",
     "OpenShift",
     "PgBouncer",
+    "Postfix",
     "PostgreSQL",
     "Praefect",
     "Prometheus",
@@ -117,6 +118,7 @@
     "runit",
     "Salesforce",
     "SAML",
+    "Sendmail",
     "Sentry",
     "Sidekiq",
     "Shibboleth",
diff --git a/doc/installation/index.md b/doc/installation/index.md
index fe0d5c135636c047b4711bcb1ab5803326e02c08_ZG9jL2luc3RhbGxhdGlvbi9pbmRleC5tZA==..3e5c825ea56720fced9f8c02c779d6a4d2624da2_ZG9jL2luc3RhbGxhdGlvbi9pbmRleC5tZA== 100644
--- a/doc/installation/index.md
+++ b/doc/installation/index.md
@@ -18,7 +18,7 @@
   Container Registry which can have their own subdomains requires certificates for
   those subdomains also.)
 - If you want to send notification emails, install and configure a mail server (MTA)
-  like sendmail. Alternatively, you can use other [third party SMTP servers](../settings/smtp.md).
+  like Sendmail or Postfix. Alternatively, you can use other [third party SMTP servers](../settings/smtp.md).
 
 ## Installation and Configuration
 
@@ -32,7 +32,7 @@
 - [Enabling HTTPS](../settings/nginx.md#enable-https).
 - [Enabling notification emails](../settings/smtp.md#smtp-settings).
 - [Enabling replying via email](https://docs.gitlab.com/ee/administration/reply_by_email.html#set-it-up).
-  - [Installing and configuring postfix](https://docs.gitlab.com/ee/administration/reply_by_email_postfix_setup.html).
+  - [Installing and configuring Postfix](https://docs.gitlab.com/ee/administration/reply_by_email_postfix_setup.html).
 - [Enabling container registry on GitLab](https://docs.gitlab.com/ee/administration/packages/container_registry.html#container-registry-domain-configuration).
   - You require SSL certificates for the domain used for container registry.
 - [Enabling GitLab Pages](https://docs.gitlab.com/ee/administration/pages/).
diff --git a/doc/settings/smtp.md b/doc/settings/smtp.md
index fe0d5c135636c047b4711bcb1ab5803326e02c08_ZG9jL3NldHRpbmdzL3NtdHAubWQ=..3e5c825ea56720fced9f8c02c779d6a4d2624da2_ZG9jL3NldHRpbmdzL3NtdHAubWQ= 100644
--- a/doc/settings/smtp.md
+++ b/doc/settings/smtp.md
@@ -7,7 +7,7 @@
 # SMTP settings **(FREE SELF)**
 
 If you would rather send application email via an SMTP server instead of via
-Sendmail, add the following configuration information to
+Sendmail or Postfix, add the following configuration information to
 `/etc/gitlab/gitlab.rb` and run `gitlab-ctl reconfigure`.
 
 WARNING: