Virtual Host of Private Page isn't sent through subscribed emails when a Public page(s) exists

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.3.3 CE GA4, 7.3.10 DXP GA1, Master
• Component/s: Mail
• Labels:
  • ee-ts
• Fix Priority: 3
• Sprint: FlexSprint7
• Git Pull Request: https://github.com/shuyangzhou/liferay-portal/pull/9081

When a Site has a public page, the Virtual host of a Private Page isn't sent through a subscriber email. It's easier to understand the issue once you go through the steps to reproduce.

Steps to Reproduce
Setup: Setup an SMTP server so you can see emails. I suggest using http://nilhcem.com/FakeSMTP/ as it is a standalone .jar file that listens for SMTP.
Make sure the SMTP port FakeSMTP is using matches the one Liferay is using at Control Panel -> Server Administration -> Mail -> Outgoing SMTP Server

1. Create two sites
1.1. Site 1 (Only private pages)
1.1.1. Set Site URL -> Private Pages to: vh-site1
1.1.2. Add a new private page: Private 1
1.1.2.1. Add the blogs portlet to this page

1.2. Site 2 (Public and private pages)
1.2.1. Set Site URL -> Private Pages to: vh-site2
1.2.2. Add a new private page: Private 1
1.2.2.1. Add the blogs portlet to this page
1.2.3. Add a new public page: Public 1

2. Configure System Settings
2.1. On Comments setting update "Email Discussion Comment Added Body" to the following:

Dear [$TO_NAME$],<br /><br />

[$COMMENTS_USER_NAME$] added a new comment.<br /><br />

----------<br />
[$COMMENTS_BODY$]<br />
----------<br /><br />

<a href="[$PORTAL_URL$]">Liferay DXP</a><br /><br />

Sincerely,<br />
[$FROM_NAME$]<br />
[$FROM_ADDRESS$]

3. Create a new user: [e-mail]

4. Create a new entry on Site 1/Private 1/Blogs portlet

5. Log in as [e-mail] and subscribe to the entry you created on step 4

6. Log in as test/test (default Admin), and add a comment to the entry you created on step 4

7. [e-mail] will receive a email with the following link. This is correct and the expected behavior
<a href="http://vh-site1:8080" target="_other" rel="nofollow">Liferay DXP</a>

8. Repeat the steps 4, 5, and 6 using Site 2

9. [e-mail] will receive a email with the link:
9.1. Actual link received
<a href="http://localhost:8080" target="_other" rel="nofollow">Liferay DXP</a>

Expected link
<a href="http://vh-site2:8080" target="_other" rel="nofollow">Liferay DXP</a>

If you delete the Public page in Site 2, the issue no longer reproduces and the link that is sent is the Expected link.

Errors
None

Testing
Reproduced in 72x-20200506
Reproduced in master-20200506. Note that in Master, Require strangers to verify their email address? is enabled by default, so you will need a verification code sent through email to login as [e-mail]. This shouldn't be an issue if you setup an SMTP server beforehand.