I have a problem with zoho campaigns...

I use Zoho campaigns for internal mailing, the problem is this, two days ago the mailings are send to SPAM, i don't know whats the problem if the mailing is for internal corporation using a email corporation. The emails corporation are generated for google, i talked to them, we make a rule for the email who send from Zoho Campaigns and still the mailing are send to SPAM.

I Hope you can help me guys.