CWP7 Email configuration - SPF, DKIM, _dmarc, rDNS

Hello,

I was looking around and I decided to make a new topic.
I have a CWP7 and I provide just one domain on.

I make an email account and configure it by my skills and knowleges. Now I have a problem.
I'm looking for help.

► I can send email, but I cannot receive.
So I test it by mail-tester.com ↓↓
1. You have more than one DKIM signature in your message.
2. You do not have a DMARC record, please add a TXT record to your domain _dmarc.mydomain with the following value:

v=DMARC1; p=none


My settings:

1.
rDNS check by bash command host:
host myip resolves to myhostname
host myhostname resolves to myip

2.
DNS Records to : /var/named/mydomain.db
mydomain.      TXT      v=spf1 +a +mx +ip4:myip ~all   
default._domainkey   TXT      14400   v=DKIM1; k=rsa; p=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX   
_dmarc         TXT      14400   v=DMARC1; p=none

3.
CWP7 DKIM & SPF Manager
on the picture