Steps to reproduce the issue

Email notifications to new registration users coming like below.

Hello {NAME},

Thank you for registering at {SITENAME}. Your account is created and must be activated before you can use it.
To activate the account select the following link or copy-paste it in your browser:
{ACTIVATE}

After activation you may login to {SITEURL} using the following username and password:

Username: {USERNAME}
Password: {PASSWORD_CLEAR}

Expected result

Actual result

System information (as much as possible)

Additional comments