I don't have any success with the Tech Support, so this seems to be the last place to ask for help.
I have email problem with one of my customers fot a long time. The first time happened about few months back. People of the company suddenly could not send/receive any email to/from me. After checking, Tech Support told me that, when receiving email, my server will send a call back or something to the sender. Because this sender had a different IP for its sending and responding source, so the email was blocked.
However from my understanding this was kind of common for many organization/institute/goverment agent. This is a very big company and one of my important customers, so I just can not ask them to chanage their IT practice. The IT on both sides insisted that they are right. I almost lost that customer.
Finally someone suggested me to change a server, and I did. And the problem was resolved.
And then, suddenly again, few days again, my customer could not send email to me. The tech support of TCH said my cilent's server did not accept blank call back, and that is the problem. And again, tech support insists they won't change the practice.
Is there a way I can get around with this ? This is a very very big company, and I believe they deals with millions of emails everyday. From my understanding I am the only one has this problem with their email. With both sides insisting on their practice, it's like forcing me to change my hosting company.
I have been with TCH for quite a few years, and I really liked it. I even recommend to my friends. But I am really very frustrated now.
Anyone knows what I should do ?