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Respuesta propuestaExchange having problems receiving emails with attatchments

  • miércoles, 25 de noviembre de 2009 19:02alexperezjr Medallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
     
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    I have a windows 2003 server SP2 with Exchange 2003. Recently we have noticed customers having problems sending us emails with attachments.

    Just to provide some info on what I have done on our network recently

    - I removed an old exchange server

    - I enabled spam filtering on our checkpoint firewall

    - We used to have a 3rd party smtp relay but now email goes directly to our exchange server

    All happened Wednesday last week and our users dint start seeing the problem until Friday that week.

    I spent 7 hours with checkpoint yesterday troubleshooting and all logs and debugs that we looked at show that the emails are getting thru the firewall fine.

    Any help solving this problem would be GREATLY! appreciated.

    -Alex

     

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  • miércoles, 25 de noviembre de 2009 20:57Johan VeldhuisMVPMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
     
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    Alex,

    Is there any antivirus software installed on theExchange server itself ?

    Regards,

    Johan
    blog: www.johanveldhuis.nl
     
  • miércoles, 25 de noviembre de 2009 21:31alexperezjr Medallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
     
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    There is but I've disabled, stopped all its services and still get the same results. If I send a 8MB file out from outlook to my personal email I get it almost instantly.

    I should probably give some more information.

    - Some attachments do get thru but some do not ie it took me 5 hours to get a ~4MB attachment from gmail after it retried several times while some other attachments get to me faster but still take 15 - 20 minutes. Larger attachments seem to be affected more that smaller ones but smaller ones (1.5MB) fail too.

    - I can see a whole bunch of sessions in the SMTP virtual server just waiting there until the timeout

    - The smtp log for these messages shows EHLO, RCPT , MAIL but no DATA and then TIMEOUT

    - A wireshark log seems to show these messages getting hung at the DATA portion of the transmission

    - To test MTU I pinged the Exchange server and the firewall(ping mail.russellbond.com -f -t 1472) and both success (1472 + 28 = MTU of 1500)

    Thank you for any help that you can provide.

    -Alex

     
  • domingo, 29 de noviembre de 2009 7:17Anil K Singh Medallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
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    HI Alex,

    Ist looking some issue in check point FW config. Can you check below and update.

    1: What about if you turn OFF spam filter engine in check point
    2: Whether sender get any kind OF NDR message when attachment failed.
    3: Is it happenig for all mailbox in your exchane server.
    Anil
    • Propuesto como respuestaAnil K Singh lunes, 30 de noviembre de 2009 15:49
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  • lunes, 30 de noviembre de 2009 4:05Brian Desmond -MVP-MVPMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
     
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    Hi Alex-


    So what's actually happening here? You've established you're having trouble receiving messages with attachments, but, there are no symptoms or indicators here.

    Are the messages simply disappearing? Are your senders receiving NDRs?

    If the messages are disappearing, turn protocol logging on on the relevant Receive Connectors (set it to Verbose in the EMC). Send a message with an attachment from an external address. Do you see anything related to the message in the log? Post that here.

    If the senders are receiving NDRs, please post a copy of the NDR.
    Active Directory, 4th Edition - www.briandesmond.com/ad4/
     
  • lunes, 30 de noviembre de 2009 15:29alexperezjr Medallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuarioMedallas del usuario
     
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    I tried turning off the spam filter off during the weekend and everything works just fine when I turn it off (with the exceptions of getting a bunch of spam)

    It seems to be related with the content filtering bit of it because when I have IP reputation filtering on everything works fine, its just when I turn on content filtering on on the checkpoint UTM.

    The checkpoint firewall is not blocking the emails because they are getting to the virtual SMTP server. Perhaps it is something that the checkpoint firewall does to the traffic that exchange doesn't like.

    -Alex