Hello, I know this is not ispconfig related question, but I spend a week on this headache problem. And I don't know how to solve the problem. I installed my system followed this tutorial which is works perfect , I have installed the auto install script written by Temporini Matteo. This is the problem. I have new registered domain, created with DKIM, DMARC , MX record, and SPF record. I tested the records with mxlookup and mail tester and everything is ok , mail tester 9,8/10 ratio. I have created three mailboxes with ISPConfig, 1. [email protected] ->Inbox OK 2. [email protected] -> Yahoo spam 3. [email protected] -> Yahoo spam When I use [email protected] account to send emails to yahoo service, all emails are in inbox. But my second and third email box [email protected] and [email protected] when send email to yahoo their emails are going to spam . So I can't understand why the first email box [email protected] works ok and all emails which I send to yahoo are going to inbox. But two others email accounts are tagged as spam.