Could not connect to SMTP svr & Svr found but doesn't respond - on external POP3 clients.

Discussion in 'Windows Small Business Server' started by OscarVogel, Apr 20, 2006.

  1. OscarVogel

    OscarVogel Guest

    This problem started very recently;

    External users with Outlook POP3 accounts can receive but can NOT send
    email. They get this error:

    "Task '<acct name> - Sending' reported error 0x80042109: Outlook is unable
    to connect to your outgoing (SMTP) e-mail server..."

    In the account properties, when I click on the "Test Account Settings..."
    button, it fails at 2 tasks; "Send Test Email Message" and "Find Outgoing
    Mail Server (SMTP)"

    The "Send Test Email Message" error is: "The specified server was found, but
    there was no response from the server. Please verify that the port & SSL
    information is correct..."

    The "Find Outgoing Mail Server" error is: "Outlook could not connect to the
    outgoing mail server (SMTP). The problem could be the server name or port or
    your server may not support SSL. Verify your port and SSL settings ..."

    This problem first appeared earlier this week. We have SBS 2003 which runs
    our only Exchange server. In the Outlook POP3 account properties "My
    Outgoing Server (SMTP) requires authentication" is checked and "Use same
    setting as my incoming mail server" is selected.

    I don't know if this had anything to do with it, but just before this
    problem first appeared, the Exchange server's database reached it's 16 GB
    limit. So I temporarily increased the database size limit by adding the
    "Temporary DB Size Limit Extension" entry in the registry. I don't know if
    the SMTP problem started before or after the database had reached it's
    limit. I became aware of the problem the next day, but I can't be at all
    sure whether or not external POP3 users could send emails last week. But I
    am sure that before a week or two ago, they had no problem sending emails
    from outside our network.

    Last night I installed all the latest service packs (and increased the limit
    to 75 GB). But this issue appears to be unchanged.

    It's only external clients with POP3 accounts that have this problem.
    (Internal POP3 & Exchange clients have no problem. Also OWA users are able
    to send with no problem).

    I'd appreciate any help. Thanks.
    OscarVogel, Apr 20, 2006
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  2. OscarVogel

    Paul Ford Guest


    What happens if you telnet to the server on port 25 (or whatever port you
    have SMTP on, 25 by default) and try and send a message that way, does this
    work ?

    Have a look at to tell you how
    to test the connection via telnet.


    Paul Ford
    Edge IT Ltd
    Paul Ford, Apr 20, 2006
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  3. OscarVogel

    OscarVogel Guest

    Thanks for responding.

    From a command prompt on external computer, when I type "telnet <server's
    ip> 25" I get this response;

    "Connecting to <server's ip>...Could not open connection to the host, on
    port 25: Connect failed"

    Of coarse, I AM able to connect from an internal computer.

    And by the way, all clients are able to receive new emails.

    Any ideas what to do next?
    OscarVogel, Apr 20, 2006
  4. OscarVogel

    OscarVogel Guest

    I think I've solved the problem.

    I've just now contacted my ISP (SBC). They confirmed that "SMTP port is
    blocked by default for third party SMTP servers due to security reasons".
    That explains why I couldn't send emails through our Exchange server (when
    I'm outside our local network).

    I strongly suspect that the KB article 302357 explains why the original User
    hasn't been able to send emails. I will change his settings when he returns
    from his trip on Monday.

    So unless I'm surprised again, I'm calling this problem solved.

    Thanks again for everybody's input.
    OscarVogel, Apr 28, 2006
  5. My ISP is blocking port 25 and told me to change my outgoing mail to their
    server. I am trying to do this but get the following message:
    Send test e-mail message: None of the authentication methods supported by
    this client are supported by your server.

    Getting in touch with my isp again.

    Keil Hunsaker, Jul 7, 2006
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