I have run in to problem.
One of my clients is not receiving emails from clients of them.
So we started to test the problem. I asked my client to ask they client to send me an email and it was successful as i`m using the same server. I have also tried to send e-mails from several email accounts from different servers and they also have reached they destination (my clients e-mail box).
My question is: Why in this case e-mails are not received from that one particular client (server)? Is this problem on my server or on they server?
I have checked the EXIM log files on my server and have not find any problem, no error messages – nothing.
My "Exim 4.77"