The user is not allowed to use plus sign in email address field of Home page

[lowendguru]

Steps:

1. Go to Home page (not sign up)
2. Use the email field in the left section of the screen to enter an email which includes a plus sign. Example: test+mail@domain.com
3. Click the "Sign up free" button located under the email field of the Home page

Expected behavior:
The user should be redirected to the "Enter name" section of the Sign up process.

Actual behavior:
The user is redirected to the "enter email" section of the Sign up process. The email entered by the user is prepoulated in the email field but the plus sign has been replaced by a space character.

This issue is only reproducible from the email field in the Home page. The issue cannot be reproduced via the SignUp page email field because in that case the plus sign is accepted normally and the user proceeds to the Name section without the issue.

See evidence:
https://lowendguru.com/miro-test/bug3.mp4