Asset Publisher can't send subscription e-mails

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.X, Master
• Component/s: Content Display Widgets > Asset Publisher widget, ~[Archived] WCM > Publication
• Labels: None
• Story Points: 1.25
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/49138

Steps to reproduce:

1. Configure mail settings in portal-ext.property
2. Login as [e-mail]
3. Add a user to test the mail setting works, assign the administrator role to the created user
4. Go to Control Panel > Configuration > System Settings > Other > Asset Publisher
5. Change the Check interval to 1
6. Add an Asset Publisher portlet AP to a page
7. Configure the asset publisher portlet, go to Subscriptions tab and enable mail subscription, then save configuration and exit configuration mode
8. Click on Subscribe on AP
9. Log out and log in using the created user
10. Add a basic web content from AP
11. Wait for 1 hour for the e-mail to be sent

Actual result:
No mail is sent.

Expected result:
Mail is sent in 1 hour.