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555 Error Driving Us Nuts

Discussion in 'E-mail Discussions' started by TheKog, Jan 29, 2008.

  1. TheKog

    TheKog Active Member

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    We are having a problem with one particular person who gets bounced whenever they email anyone on our dedicated server. We do have default spamassasin, exim, etc enabled on Centos 4.

    Here is the bounce msg:

    OURIP does not like recipient.
    Remote host said: 550-Callback setup failed while verifying <captwayne@doalures.com>
    550-Called: 207.154.28.216
    550-Sent: MAIL FROM:<>
    550-Response: 555 fully qualified email address required (#5.5.1)
    550-The initial connection, or a HELO or MAIL FROM:<> command was
    550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards
    550-RFC requirements, and stops you from receiving standard bounce
    550-messages. This host does not accept mail from domains whose servers
    550-refuse bounces.
    550 Sender verify failed
    Giving up on OURIP

    These folks can email anyone except any of the accounts on either of our servers which are identically configured.

    We think the problem is something on our end, EXIM or perhaps SPAM ASSASIN -- how can we figure out what is causing these bounces? We seem to receive email fine from tons of other people except these folks. It makes us concerned that perhaps others have gotten a bounce that have not notified us.
     
  2. TheKog

    TheKog Active Member

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    OK we figured out this was due to enabling the sender verification call out -- must have been enabled when we went from cpanel10 to cpanel11. How do we determine the EXIM version available in the current stable release before upgrading to the current stable?
     
  3. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    The latest Exim Version supported is 4.68 for all builds. If you are on the deprecated mbox format, you can only use up to version 4.63.
     
  4. TheKog

    TheKog Active Member

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    OK look slike we finally have to do the conversion. To make it fast as possible we are asking all to purge/backup their mailboxes. In cpanel where are the mailbox files located so we can check their sizes and warn the 'bad' users?

    I see all the stuff in useraccount/mail but that looks like stuff for webmail not the actual pop3 mailbox files exim delivers to.
     
    #4 TheKog, Jan 30, 2008
    Last edited: Jan 30, 2008
  5. TheKog

    TheKog Active Member

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    Disabling use of callouts on sender verify

    One more question -- one of our servers is using exim 4.68, and unlike 4.63 in the exim configuration manager it does not have an option to enable/disable the use of callouts. How is this accomplished on EXIM 4.68 or 9?


    Use callouts to verify the existence of email senders. Basiclly, exim will connect to the mail exchanger for a given address to make sure it exists before accepting mail from it.
     
  6. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    Note, the mail is stored in ~/mail. The same files are used for POP3, IMAP and webmail.
     
  7. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    In the Exim Configuration Editor, under Mail uncheck Sender Verification [?] to disable sender verification checks. If you do not see this option, ensure you are using the latest build of cPanel/WHM.
     
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