550-The recipient cannot be verified email problem

Discussion in 'Installation/Configuration' started by safoo, Nov 27, 2006.

  1. safoo

    safoo New Member

    Seems to be a simple problem, but I can not figure this one out:

    I have a Ubuntu server setup using the perfect setup for 6.06 and with Ispconfig. This server's hostname is server.anaselectronics.com.

    anaselectronics.com is on the main IP of the system. On a 2nd IP, I have asuslaptops.net. Both of these sites are setup through Ispconfig. I can send and receive emails to both domains successfully from:
    - from email address of one domain to the other domain
    - from php scripts on the server using the php mail() function
    - from my gmail account

    The problem I have occurs when sending email from a different server housed at a different datacenter. The hostname is server.nyxmotorsports.com and the domain being used for sending the email is case-mod.com.

    When sending email from [email protected] to [email protected], the emails go through just fine.

    When sending email from [email protected] to anyth[email protected], I get the following errors:

    If sending from thunderbird, it says
    If sending mail from telnet mail.case-mod.com 25, it accepts RCPT TO: <[email protected]>, but RCPT TO:<[email protected]> returns
    If sending from the php mail() function using a php script on case-mod.com server, emails sent to [email protected] go through. Any emails sent to [email protected] do not come through and bounce back after few hours:
    So basically, it seems the site setup on the main IP of the server can receive emails without any problems. The problem I am having here seems to occur on a domain that is setup on a secondary IP in Ispconfig.

    Thanks in advance for any help.
    Last edited: Nov 27, 2006
  2. safoo

    safoo New Member

    var/log/mail.log shows the following just after trying to send an email to [email protected] from thunderbird:

    Another question: currently the MX records for asuslaptops.net points to it's IP address. Should these point to anaselectronics.com instead?

    What should be in /etc/mailname...I currently have "www.anaselectronics.com"
    Last edited: Nov 27, 2006
  3. safoo

    safoo New Member

    another question

    Do you I need to list additional IP's in /etc/hosts. Currently I have:

    Code:       localhost.localdomain localhost    server.anaselectronics.com server
    Do I need to add asuslaptops.net asuslaptops?
  4. till

    till Super Moderator Staff Member ISPConfig Developer

    Is asuslaptops.net registered in DNS and does it have a A-Record that points to your server IP address?

  5. safoo

    safoo New Member

    The main IP of the server is I have a 2nd IP of

    In Ispconfig, anaselectronics.com has IP set to and asuslaptops.net is set to

    In DNS, which is set through my registrar, the A and MX records for asuslaptops.net both point to

    So you are saying that the A record should point to and the MX record point to
  6. safoo

    safoo New Member

    Ok...I have changed the MX record for asuslaptops.net. It doesn't solve my problem of the emails being rejected when emailed from case-mod.com.

    As i mentioned, sending from gmail works just right. What I think it happening is that my postfix is rejecting email from case-mod.com perhaps due to some setting it doesn't like for email received from case-mod.com . Any way to find out why this is happening?
    Last edited: Nov 28, 2006
  7. till

    till Super Moderator Staff Member ISPConfig Developer

    The configuration problem for this error is on case-mod.com. Is case-mod.com hosted on your server?
  8. safoo

    safoo New Member

    Thanks for the direction, Till.

    After more reading, I saw some mention of /etc/localdomains file. It seems on case-mod.com server, it showed asuslaptops.net as a localdomain. Deleting that entry from cpanel seems to have fixed the issue.

    You were correct that it was a problem on that server.
    Last edited: Nov 29, 2006

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