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Cannot send email to one Customer but other servers can?

Discussion in 'E-mail Discussion' started by xanadu, Mar 9, 2018.

  1. xanadu

    xanadu Member

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    A user has one client in China to whom emails from his cPanel server get rejected BUT he can send emails from other email services, such as his ISP email address, and they are received by the Chinese Customer.

    Typically the error message is 'timed out'.

    I have thoroughly checked all DNS records involved but can't find the answer?

    Can any body help please?
     
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

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    Hello,

    Try to connect to that remote mail server's IP address from the cPanel server's command line via telnet to see if it fails. EX:

    Code:
    telnet IP 25
    If so, it's possible a firewall rule is blocking the connection (either on the cPanel server or on the remote mail server).

    Thank you.
     
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