Message header originating from my server showing wrong IP address
We recently added a PTR and SPF record for our domain. Now suddenly we have a company whom we frequently send mail to rejecting mail from us. I inspected a message header sent from our mail server and it shows the correct domain name for our mail server but the corresponding IP address is wrong. The IP being shown does belong to us but it's not the correct one. Can someone please tell me how to correct this?