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Last weekend our mail server suddenly can not receive any email from outside.
I checked the server status, it can send to anybody. When I use my own account send email to myself (via outlook or web mail, all working), mails can be received quickly. I tried telnet port 25 from office, it is also working well.
But if I send mail from a gmail account (or any other account), the mail can not be received. And the gmail has no error message returned
And I tried restart smartermail service, nothing changed
Anybody have some idea what happened to my server?
Thank you for any help