we had configured one mail server in our local place. the problem some domain not received mail properly. they bounced.
The number of failures for the enquiry mail from email@example.com
The enquiry mail send from firstname.lastname@example.org
fails, but when we forward some of the enquiry mails from our email id the mail is delivered.
We are receiving mails from the client but when we reply to him it bounces. I have attached a sample mails for both the cases.
we update any DNS records.
Regarding this please advise me.