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  1. #1
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    mail delivery problem with attachments

    We have an NT 4.0 SP6a server running Exchange server 5.5 SP4. Exchange server routing is setup to be able to relay mail only for specific internal IP addresses. We have a third party application that constructs an e-mail. When the e-mail contains an attachment we can not send the e-mail outside of the company. No attachment = no problem. No problems with Outlook generated e-mails with attachments either. The event log shows a connection being made to the destination. Then shortly afterwards a 'host unreachable' event. BTW, the vendor of the third party app says they have other clients using NT 4.0 SP6a & exchange 5.5 Sp4 with no difficulties. Anyone have any suggestions?

    Thanks,
    Joe
    Joe

  2. #2
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    Re: mail delivery problem with attachments

    What firewall and routers are you using? Will any attachment send or just ones over a specific size? There are some issues with attachments failing with certain routers or firewalls but small attachments work.

  3. #3
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    Re: mail delivery problem with attachments

    MJ, Thanks for the quick response. We have a couple year old Watchguard Firebox firewall and a Netropa router (not sure which model). No attachments will send. The attachments are pretty small (less than 1 MB) - as this is for a demo. We have no limits set on any user for e-mail size. This only happens with the third part app not Outlook. Any attachment of any size works fine with Outlook.

    Joe
    Joe

  4. #4
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    Re: mail delivery problem with attachments

    do you have size limits for relay set on the server?

  5. #5
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    Re: mail delivery problem with attachments

    Neither the IMS nor any user has size limits set for incoming or outgoing messages.

    Joe
    Joe

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