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  1. #1
    Join Date
    Mar 2004

    505 error email plight

    When we send any email from a cpanel server with "Verify the existance of email senders" turned on in the exim configuration in WHM to any email account on our other server at we get the following immediate bounce error:

    550-Unrouteable address
    550 Sender verify failed

    We are using the default nameservers 1and1 assigned us so I'm not sure what the problem might be. Records in Plesk for look clean, but maybe I'm missing something. If it's RDNS related, what specifically would we need to tell the registrar? Any other advice or suggestions?

  2. #2
    Join Date
    Oct 2003
    A SMTP dialogue to your server looks pretty good:
    > telnet 25
    220 ESMTP
    mail from: a (at)
    250 ok
    rcpt to: a (at)
    250 ok
    So I doubt it's a Plesk problem.

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