Tested unsuccessful

My steps:

Using my own website I created two users

1. Testuser1, registered, system mails enabled
2. Testuser2, registered, system mails disabled

I set the "Send Mail to Administrators" Option in the User Options to yes

I registered from the Frontend with a new user
Newuser1

• The Administrator got an email
• The registered user with system mails enabled got an email

I downloaded the prebuilt package Joomla_3.10.5_to_3.10.6-rc2-dev+pr.36993-Development-Patch_Package.zip and updated Joomla with it.

I registered from the Frontend with a new user
Newuser2

• The Administrator got an email
• The registered user with system mails enabled got an email

Could you check the other options as well please

I may have missed one

Tested now with:

Self - Failed
None - Failed
Administrator - Success

and can you confirm you had three fail before?

I tested now the other two options without the patch and its the same.

Self - Users with no Admin rights get the mail
None - Users with no Admin rights get the mai
Administrator - Only Admin gets the mail

ok I will take a real look. I only tested it on j4 so probably made a mistake when just typing it into j3

Thank you. Could there be something wrong with the prebuilt package, can I use it as an update like I did?

no - its more likely to be me

please try #36997

Open en closed to try fix issues with the issue tracker