Fix EmailsOnPush to allow sending from @company.com for GitLab at gitlab.corp.company.com.

app/mailers/notify.rb

@@ -34,6 +34,20 @@ class Notify < ActionMailer::Base
     )
   end
 
+  # Splits "gitlab.corp.company.com" up into "gitlab.corp.company.com",
+  # "corp.company.com" and "company.com".
+  # Respects set tld length so "company.co.uk" won't match "somethingelse.uk"
+  def self.allowed_email_domains
+    domain_parts = Gitlab.config.gitlab.host.split(".")
+    allowed_domains = []
+    begin
+      allowed_domains << domain_parts.join(".")
+      domain_parts.shift
+    end while domain_parts.length > ActionDispatch::Http::URL.tld_length
+
+    allowed_domains
+  end
+
   private
 
   # The default email address to send emails from
@@ -50,7 +64,8 @@ class Notify < ActionMailer::Base
       address = default_sender_address
       address.display_name = sender.name
 
-      if send_from_user_email && sender.email.end_with?("@#{Gitlab.config.gitlab.host}")
+      sender_domain = sender.email.split("@").last
+      if send_from_user_email && self.class.allowed_email_domains.include?(sender_domain)
         address.address = sender.email
       end
 

spec/mailers/notify_spec.rb

@@ -607,11 +607,14 @@ describe Notify do
 
       let(:send_from_committer_email) { true }
 
-      context "when the committer email domain matches" do
+      before do
+        allow(Gitlab.config.gitlab).to receive(:host).and_return("gitlab.corp.company.com")
+      end
+
+      context "when the committer email domain is within the GitLab domain" do
 
         before do
-          allow(Gitlab.config.gitlab).to receive(:host).and_return("gitlab.dev")
-          user.update_attribute(:email, "user@#{Gitlab.config.gitlab.host}")
+          user.update_attribute(:email, "user@company.com")
           user.confirm!
         end
 
@@ -621,7 +624,25 @@ describe Notify do
         end
       end
 
-      context "when the committer email doesn't match" do
+      context "when the committer email domain is not completely within the GitLab domain" do
+
+        before do
+          user.update_attribute(:email, "user@something.company.com")
+          user.confirm!
+        end
+
+        it "is sent from the default email" do
+          sender = subject.header[:from].addrs[0]
+          expect(sender.address).to eq(gitlab_sender)
+        end
+      end
+
+      context "when the committer email domain is outside the GitLab domain" do
+
+        before do
+          user.update_attribute(:email, "user@mpany.com")
+          user.confirm!
+        end
 
         it "is sent from the default email" do
           sender = subject.header[:from].addrs[0]