Why E-mail stopped to relay my ISP?

I had my server running beautifully for serval months now.  Last Friday, we noticed that some of the emails from our office did not reach their destination in a few minutes. Some would take hours and days. I could very well receive emails. We organize our company e-mail service in the House on a mac mini with OX 10.11.6 5.1.7 server. In case of problems today, I determined that the implementation of relay on the server is correct, but when I need local customers send the relay through our server it fails. If I uncheck this requirement, local customers can send very well.

The requirement of relay works well until last week. Without going through this may very well at the moment, but it seems counter-intuitive. Is there a problem with the installation of relay that needs work to update or rinsed out properly?

Now that I have turned off the outgoing 'Through ISP mail relay' switch I received a call from a person in Texas who does not work for us. He received an e-mail from his home account to our domain name.

It doesn't have an e-mail account in our system. How is this possible, and is this power flowing through our mail server?

Tags: Servers and Enterprise Software

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