451 Temporary local

Discussion in 'Server Operation' started by if85myh, Nov 8, 2011.

  1. if85myh

    if85myh New Member


    I am recently facing a small problem. I have sent some emails to different addresses and after a few days I receive a response from several addresses like:

    Where is the problem, it seems strange that different servers to respond with the same error at the same time. Is it from my server?

    I am using an older version of Fedora (Core 4) with postfix, spamassasin, dovecot.
  2. if85myh

    if85myh New Member

    Ok, I have contacted the parteners I am trying to send emails to and they have something like:
    in their logs.

    From what I understand is they have sender verify callout enabled on their server (exim).

    My server 25 port isnt blocked, but I am using spamassasin which may delay the responses to Exim's commands, still i have added their host in our whitelist with no success.

    Anyone knows a fix for my postfix server?
    Last edited: Nov 9, 2011
  3. falko

    falko Super Moderator ISPConfig Developer

  4. if85myh

    if85myh New Member

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