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Remote server can't resolve email sender domain

Discussion in 'E-mail Discussion' started by Malagana, Oct 5, 2018.

  1. Malagana

    Malagana Member

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    Hi, a couple days ago I updated my server to WHM v74.0.9 but right now some accounts with dedicated IP address are having issues sending and receiving email from and to certains domains. The weird thing is that If we sent email from one host account ussing the main server ip address to those domains the emails are delivered OK

    The exim message is the following:

    Code:
    SMTP error from remote mail server after pipelined MAIL FROM:<xxx@xxx.xxx> SIZE=124910: 451 4.1.8 Domain of sender address [EMAIL]xx@xxx.xxx[/EMAIL] does not resolve
    And also for the domain where we are sending our email

    retry time not reached for any host for 'to-client-domain.com'

    The sender from one of the domains with this issue get this message:
    451 xxxx.com Name server timeout

    • Our domain is resolving OK
    • We have checked PTR records and are OK
    • We dont have any firewall issues
    Any Ideas?
     
    #1 Malagana, Oct 5, 2018
    Last edited by a moderator: Oct 5, 2018
  2. 24x7server

    24x7server Well-Known Member

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  3. Malagana

    Malagana Member

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    Hi,

    The setting “Send mail from the account’s IP address” is enabled, each acccount that has a dedicated IP address has is PTR record OK so the sending domains resolve to the dedicated IP.

    I don’t know if this is a DNS issue or where to look to know what is happening here. Since the remote server can’t find or resolve the email senders domain on our server

    I didn’t do anything else besides the update to WHM.
     
  4. cPanelLauren

    cPanelLauren Forums Analyst II
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    Hi @Malagana

    Do you have anything in /etc/mailhelo?
     
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  5. Malagana

    Malagana Member

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    @cPanelLauren yes we have some content in the /etc/mailhelo and /etc/mailips file but the next two options are off right now


    Reference /etc/mailhelo for outgoing SMTP HELO
    Reference /etc/mailips for outgoing SMTP connections
     
  6. cPanelLauren

    cPanelLauren Forums Analyst II
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    HI @Malagana

    Is it only occurring with specific IP addresses or all of the dedicated IP addresses?
     
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