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Helo hostname mismatch?

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  • Helo hostname mismatch?


    When some of our users at mycompany send an email to several companies they receive the following message and the email is not delivered:

    [email protected] on 12-3-2009 12:30

    You do not have permission to send to this recipient. For assistance, contact your system administrator.

    < #5.7.1 smtp;550 5.7.1 <[email="[email protected]"]Recipient address rejected: Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: MTA hostname: unknown[213.144.227.xx] (helo/hostname mismatch)>

    I checked to see if it was on any blacklist but it isnt.

    So I did a nslookup on 213.144.227.xx and i didnt get but something completely different:

    Therefore i think there is a mismatch

    Now i suppose there are three options:

    1) log on to and change the helo/ehlo name into
    2.1) register an A-record at the people who host
    2.2) register a PTR record at (ISP)

    So here come my questions:
    1. Are my statements correct?
    2. What is the best option
    3. What is the fastest option
    4. What is the cheapest option?
    You probably noticed im not very experienced so any other advice is more then welcome.

    Thanking you in Advance.


  • #2
    Re: Helo hostname mismatch?

    Speak to your ISP and get them to setup a PTR for your IP address which is your 2.2 and is the best, fastest and cheapest!
    PTRs are for IP addresses and will "fix" the nslookup you are seeing.

    Please read this before you post:

    Quis custodiet ipsos custodes?


    • #3
      Re: Helo hostname mismatch?

      Ok thanks!

      BTW option 1 a bad thing because i expose my server name?