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Mail relaying problem

  • 17-01-2009 2:29pm
    #1
    ratsam
    Registered Users, Registered Users 2 Posts: 248 ✭✭


    Hi

    Just upgraded our office with faster broadband from BT. In doing so we have a new static IP address. Our host is forwarding all mail to this new IP but now we can only send emails within our own IP Range. They will not leave our office. We get the following message......

    This is the Postfix program at host mcgnie.ie.

    I'm sorry to have to inform you that your message could not be
    be delivered to one or more recipients. It's attached below.

    For further assistance, please send mail to <postmaster>

    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.

    The Postfix program

    <richiehatch@gmail.com>: host mail.esat.net[193.95.141.49] said: 550 relaying
    to <richiehatch@gmail.com> prohibited by administrator (failed to find host
    name from IP address) (in reply to RCPT TO command)
    Reporting-MTA: dns; mcgnie.ie
    X-Postfix-Queue-ID: 2C05B1182222
    X-Postfix-Sender: rfc822; rh@mcgnie.ie
    Arrival-Date: Sat, 17 Jan 2009 13:33:28 +0000 (GMT)

    Final-Recipient: rfc822; richiehatch@gmail.com
    Action: failed
    Status: 5.0.0
    Diagnostic-Code: X-Postfix; host mail.esat.net[193.95.141.49] said: 550
    relaying to <richiehatch@gmail.com> prohibited by administrator (failed to
    find host name from IP address) (in reply to RCPT TO command)

    From: Richard Hatch <rh@mcgnie.ie>
    Date: 17 January 2009 13:33:10 GMT
    To: Richard Hatch <richiehatch@gmail.com>
    Subject: test

    Any ideas where I might have gone wrong. All outgoing mails are relayed through mail.esat.net through our Xserve. I'm lost now...!!!

    Rats


Comments

  • #2
    wandererz
    Registered Users, Registered Users 2 Posts: 2,834 ✭✭✭wandererz


    Why are you relaying through mail.esat.net?

    Why not just let your email server send mail directly to the recipient mail server?

    The recipient mail server is doing a reverse mx lookup and that shows up as your 209.160.x.x address. Which does not concur with the IP address that the mail is being received from (i.e. mail.esat.net) and hence the server rejects it.

    Stop relaying via mail.esat.net and you should be ok.

    (provided of course that you have a proper mail filtering solution in place)
    .


  • #3
    ratsam
    Registered Users, Registered Users 2 Posts: 248 ✭✭ratsam


    Yes thank you..... That is exactly what the problem was.... I figured it out on Saturday and forgot to check back here. For some reason the tech guy we had set up our email server had it set up like this with all email being relayed through esat and it worked fine. But when I changed our static IP address it broke it. Probably some mx records problem. Regardless its working now....!

    Thanks again for the response.

    Rats


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