Set MX record for Google Mail on CPanel

That’s too crazy to not to write about:

For activate e-mail service in Google Business Suite, you need to set @ or empty string in “Host record” field of an MX record of your domain. However, you cannot set either, you get validation error from CPanel.

Solution: enter domain name and a dot (.), e.g. domain.net. into host record field (see this answer on CPanel forum).