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Remote server can't resolve email sender domain

Malagana
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: SMTP error from remote mail server after pipelined MAIL FROM: SIZE=124910: 451 4.1.8 Domain of sender address xx@xxx.xxx 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?

Comments

11 comments

Date Votes
  • 24x7server
    Hi, There is a setting in the WHM like the one mentioned below. Can you check if that is enable? Enable the Send mail from account's dedicated IP address option in WHM's Exim Configuration Manager interface [ Home >> Service Configuration >> Exim Configuration Manager ]. How to Configure the Exim Outgoing IP Address - cPanel Knowledge Base - cPanel Documentation
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  • Malagana
    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.
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  • cPanelLauren
    Hi @Malagana Do you have anything in /etc/mailhelo?
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  • Malagana
    @
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  • cPanelLauren
    HI @Malagana Is it only occurring with specific IP addresses or all of the dedicated IP addresses?
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  • Malagana
    HI @Malagana Is it only occurring with specific IP addresses or all of the dedicated IP addresses?

    Hi, Lauren this behavior happens with domains using a dedicated IP address, but not with all e-mail recipients.
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  • cPanelLauren
    Hi @Malagana Does the issue persist if you remove the data from /etc/mailhelo
    (regardless of whether or not you have the setting to reference it enabled) Also, can you run a successful traceroute to the IP addresses in question?
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  • Malagana
    Hi @Malagana Does the issue persist if you remove the data from /etc/mailhelo
    (regardless of whether or not you have the setting to reference it enabled) Also, can you run a successful traceroute to the IP addresses in question?

    Hi, Lauren Right now the domain is using the info on /etc/mailhelo and /etc/mailips using the server IP instead the dedicated for sending emails, with the sames results. Below are the response from the remote mail server when I tested from Telnet: telnet INBOUND.pok.com.mx.NETSOLMAIL.NET 25 HEK220 inbound.net.registeredsite.com ESMTP SMTP Service (NO SPAM/UCE) helo c2e-us.net 250 atl4mhib41.myregisteredsite.com Hello chrome.cliccreativelabs.com [142.44.136.138] (may be forged), pleased to meet you mail from: test@c2e-us.net 451 4.1.8 Domain of sender address test@c2e-us.net does not resolve Connection closed by foreign host.
    Regarding to the accounts with dedicated IP we can send mails without problems to others domain, the webs are resolving OK and also I can traceroute to the dedicated IP without problems from other machines. I'm going to try deleting the content inside /etc/mailhelo but until now nothing seems to work. I do'nt know if is something that we can't fix from our side.
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  • cPanelLauren
    I'm going to try deleting the content inside /etc/mailhelo but until now nothing seems to work.

    Let me know how it goes removing the information there - if this doesn't work can you please open a ticket using the link in my signature? Once open please reply with the Ticket ID here so that we can update this thread with the resolution once the ticket is resolved. Thanks!
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  • Malagana
    Let me know how it goes removing the information there - if this doesn't work can you please open a ticket using the link in my signature? Once open please reply with the Ticket ID here so that we can update this thread with the resolution once the ticket is resolved. Thanks!

    Hi, Lauren The support request ID is 10623945
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  • cPanelLauren
    Hi @Malagana Thanks for that, I've found the ticket and I'm currently watching it. I'll update here with the outcome when available. Thanks!
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