Some days ago my Email box is returning errors to send my emails.

After I have configured DKIN and SPF. (I don't know if this the cause)

For some mail boxes I got:

contato@casamentosonthebeach.com.br  DOMAIN_NOT_RESOLVED, ERROR_CODE :DOMAIN_NOT_RESOLVED 

Note that is just a sample, I got this error for other emails.

Sometimes after I send an email, it is marked as Draft, keeping the delivered icon.

Some clients are not receiving my emails.

Can you help me ?

Best