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550 5.7.1 Mail Rejected.

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  • 550 5.7.1 Mail Rejected.

    All --

    I'm having the following issue when sending out to optonline.net (Cablevision) e-mail addresses. I recently changed the mail server's external IP, but i'm pretty sure i covered all bases on DNS..

    I get the following bounce back from my exchange server..

    "You do not have permission to send to this recipient. For assistance, contact your system administrator.
    <mail.phippsny.org #5.7.1 smtp;550 5.7.1 Your mail from IP 66.104.233.38 was rejected. We can't currently accept your message. : [email protected]>"

    I've checked with optonline.net and they indicated that the problem is on my end since my IP has cleared all their RBL's. I can't figure out what it could be on my end since this was working prior to the IP change.

    Exchange 2003 SP1.

  • #2
    Re: 550 5.7.1 Mail Rejected.

    Is mail.phippsny.org your server or theirs?

    Comment


    • #3
      Re: 550 5.7.1 Mail Rejected.

      This is standard ISP buck passing.
      Their server is rejecting your email. However only they can tell you why as their NDR doesn't say why.

      Your PTR record is correct.
      However I cannot telnet to 66.104.233.38 on port 25 which may cause some sites to reject the email on a call back.

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
      More Exchange Content: http://exchange.sembee.info/
      Exchange Resources List: http://exbpa.com/
      In the UK? Hire me: http://www.sembee.co.uk/

      Sembee is a registered trademark, used here with permission.

      Comment


      • #4
        Re: 550 5.7.1 Mail Rejected.

        mail.phippsny.org is my mail server.

        I only allow SMTP traffic from the postini services to my mail server. I don't allow any other traffic inbound from any other source. Which is why when you tried to telnet to that IP, it didn't work. Outbound, i allow SMTP, DNS to any destination.

        This configuration worked perfectly prior to an IP change, not quite sure what cablevision is doing now.

        I've spoken to multiple techs there and they keep hammering me with the fact that as long as my IP is not listed on their BL's, then i should be good.

        This is becoming very frustrating!

        Comment


        • #5
          Re: 550 5.7.1 Mail Rejected.

          If you are using Postini for inboudn email then your best option is to use them for outbound email as well. Then you will not have any issues with the email delivery. I find most ISP tech support are close to useless, unless you can talk to the backroom guys who are actually doing the work, those on the phones do not have a clue and just want rid of you becuase you aren't a customer (although it could be said that they woudl want rid of you even if you were a customer).

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

          Comment

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