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Thread: Mail Delivery Problem

  1. #1
    plan9 is offline Loyal Member
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    Default Mail Delivery Problem

    Last week I had a user receive the following two messages:

    lost connection with host.domain.com [x.x.x.x] while sending message body

    - and -

    connect to host.domain.com [x.x.x.x]: server dropped connection without sending the initial SMTP greeting

    Both of these bounces came from the same destination. My user had a couple of moderately sized attachments on each message (about 1 MB each).

    I would have thought it if was a problem with the attachment size I'd see a different message.

  2. #2
    uxbod's Avatar
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    Default

    Depends on how the remote server has configured their MTA. It may also be not the size but the file extension that is being blocked.

  3. #3
    plan9 is offline Loyal Member
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    That thought had crossed my mind as well. The attachments in question were PDF files, so I assumed that they wouldn't be blocked.

    Does it sound like an issue on the destination side then?

  4. #4
    uxbod's Avatar
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    Well if it is when one of your users is sending to someone else outside of your company then I would say yes, and the message
    lost connection with host.domain.com [x.x.x.x] while sending message body
    would appear to back that up. If you telnet to that host on port 25 can you send a email through manually ?

  5. #5
    plan9 is offline Loyal Member
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    When I attempt to send a message via telnet, I receive the following error:

    501 5.1.8 bad address syntax

    I've tested sending to recipients at other domains this way and it works just fine.

  6. #6
    uxbod's Avatar
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    it will depend on what checks they have in place. for the sender/recipient try something like
    Code:
    from: <itsme@domain.com>

  7. #7
    plan9 is offline Loyal Member
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    I continue to get the "501 5.1.8 bad address syntax" error when I enter the MAIL FROM:user@domain.com.

    I've had no problem sending messages elsewhere. I'm just not sure if its a misconfiguration at the destination or some check they're doing that others aren't.

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