HTML Mail module, how to add line breaks in the body section

I’m new to Drupal and I’m having issues in creating line breaks in the email that is sent out when a new admin/user is added. The content in the admin/config/people/accounts for emails is set as below:
[user:one-time-login-url]

This link can only be used once to log in and will lead you to a page where you can set your password.

After setting your password, you will be able to log in at [site:login-url] in the future using:

username: [user:name]
password: Your password

— [site:name] team

but the user is receiving it as:

https://xyz.com/user/reset/12538/1476295088/YgsdDwXMbbPmhW-daDVNrA4odTa3… This link can only be used once to log in and will lead you to a page where you can set your password. After setting your password, you will be able to log in at https://xyz.com/user in the future using: username: localdevadmin password: Your password — xyz team

without any line breaks. When i checked the raw message the content type is shown as below:
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8; format=flowed; delsp=yes

and the content has line breaks. I have tried adding
,
, “rn”, ‘n’ but it still doesnt show up with line breaks when the emails are received and the html tags are removed while php new line just adds the text. Is there any solution for this issue?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/4/feed