Emails are not sent after creating a new account

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP59, 7.0.0 DXP SP9, 7.0.X, 7.1.10 DXP FP3, 7.1.1 CE GA2, 7.1.10.1 SP1, 7.1.X, Master
• Component/s: User Management
• Labels:
  • 7.0-blocker
  • QA-AUTOMATION
  • QA-FP
  • ee-ts
  • liferay-dxp-70-sp9
  • liferay-dxp-71-sp1
  • liferay-fixpack-de-59-7010
  • liferay-fixpack-dxp-3-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/63330

Steps to Reproduce:

1. Go to Server Administration > Mail , configure POP and SMTP server.
2. Add a new user with a valid email address.

Expected Results:
An email should be sent to the new created user with a password.

Actual Results:
No email is sent.

Reproduced on:
Tomcat 9.0.10 + MySQL 5.7. Portal master GIT ID: ad87fa7d1008e58825e7ac0e1b6d8c1104671d2b.
Tomcat 9.0.10 + MySQL 5.7. Portal 7.1.x GIT ID: 3a7bebed0d1a0839046e6502a65109d67309c032.
Tomcat 8.0.53 + MySQL 5.7. Portal 7.0.x-private GIT ID:
9cb0d4fd78f754eb1deadb5cfb1143f12cb558fc