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HELP Exchange 5.5 Relay problems...

  • 13-11-2003 5:53pm
    #1
    Bannor
    Closed Accounts Posts: 815 ✭✭✭


    I'm having a problem with the excange server.

    When I open a telnet session and test the relaying facilty it seems secure.

    220 exch.*****.ie ESMTP Server (Microsoft Exchange Internet Mail
    Service 5.5.2655.55) ready
    HELO me
    250 OK
    MAIL FROM: bogus@bad.bob
    250 OK - mail from <bogus@bad.bob>
    RCPT TO: bogus@bad.bob
    550 Relaying is prohibited

    Yet somehow there were dozens of spam messages which were received today pending in the outbound queue when I checked earlier.

    :confused:

    I've cleared the queue and rebooted the server but it's a bit of a worry as to how the Exchange Server accepted the spam messages in the first place.


Comments

  • #2
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 92,550 Mod ✭✭✭✭Capt'n Midnight


    Into IMC properties

    Routing
    Routing Restrictions
    Add in your local subnets
    eg. 192.168.x.y

    Hosts that can never route email
    [php]
    0.0.0.0 128.0.0.0
    129.0.0.0 192.0.0.0
    193.0.0.0 255.0.0.0
    194.0.0.0 255.0.0.0
    195.0.0.0 255.0.0.0
    196.0.0.0 252.0.0.0
    200.0.0.0 248.0.0.0
    208.0.0.0 240.0.0.0
    224.0.0.0 224.0.0.0
    [/php]


    "Use the Routing Restrictions dialog box to specify senders who cannot use your site to host and relay messages to recipients outside of your organization."


  • #3
    Bannor
    Closed Accounts Posts: 815 ✭✭✭Bannor


    Originally posted by Capt'n Midnight
    Into IMC properties

    Routing
    Routing Restrictions
    Add in your local subnets
    eg. 192.168.x.y

    Is this under "Hosts and clients with these IP addresses"? Previously I've always had the checkbox ticked and left the IP Address and Mask fields empty.

    Hosts that can never route email
    [php]
    0.0.0.0 128.0.0.0
    129.0.0.0 192.0.0.0
    193.0.0.0 255.0.0.0
    194.0.0.0 255.0.0.0
    195.0.0.0 255.0.0.0
    196.0.0.0 252.0.0.0
    200.0.0.0 248.0.0.0
    208.0.0.0 240.0.0.0
    224.0.0.0 224.0.0.0
    [/php]


    "Use the Routing Restrictions dialog box to specify senders who cannot use your site to host and relay messages to recipients outside of your organization."
    I've updated this table.

    Thanks for the info.


  • #4
    theciscokid
    Closed Accounts Posts: 1,006 ✭✭✭theciscokid


    try http://www.abuse.net/relay.html to make sure

    also

    http://members.iinet.net.au/~remmie/relay/


    check ur mx records too!

    try

    www.checkdns.net


  • #5
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 92,550 Mod ✭✭✭✭Capt'n Midnight


    How do you get Exchange 5.5 to block incoming email that fails a reverse dns lookup (ie spoofed) ?

    BTW those IP masks don't block all addresses..


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