What can I do to prevent the registration email from getting into the Razor2 spam filter?

Question

Fight against spam

An ordinary non-spam email with login data to the user's personal account suddenly began to fall into spam.
mailtester says:

RAZOR2_CF_RANGE_51_100	Razor2 gives confidence level above 50% cf: 100
RAZOR2_CHECK	Listed in Razor2 (http://razor.sf.net/)

The question is what to do with it? The letter was rewritten, but there are key points from which it will not be possible to escape ... So it did not help.

Answer 1

The problem is in the content of the email. The only way to find out is by testing. You can split the letter into parts and check what exactly the spam filter does not like