Re: SMTP Woes

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From: MR (comconix_at_newsgroup.nospam)
Date: 03/14/05

  • Next message: Skipster: "Re: SMTP Woes" 
    Date: Mon, 14 Mar 2005 20:16:02 +0200

    I am beginning to feel like it is a losing battle. i just noticed that i
    have over 500 current SMTP sessions!!!!
    i limited the maximum sessions to 20 and now incoming email is being lost or
    delayed for a long time

    i thought that i could have all my mail routed to my ISP and give them the
    list of valid email addresses in my company (only about 15) and then using a
    POP3 connector, pull the filtered messages into my server. the problem with
    this is that there is no POP3 connector in Exchange2003 (enterprise). It
    looks like i have to go to a third party. does anyone have any experience
    with this?
    will it work?

    "MR" <comconix@newsgroup.nospam> wrote in message
    news:eG7kaKIKFHA.3908@TK2MSFTNGP10.phx.gbl...
    > My mail server is being bombarded with SMTP messages. There are only about
    > 5 users in the company yet we are receiving about 18,000 SMTP attempts per
    > hour! Of those maybe 10 are valid messages. This is bringing our internet
    > connectivity to its knees.
    >
    > I am running Exchange 2003. my firewall is ISA 2004.
    >
    > I am looking for ways to mitigate this problem.
    > 1) I tried increasing the line speed but that did not help because the
    > number of current SMTP sessions just increased.
    > 2)I limited to number of simultaneous sessions to 3 (it was unlimited
    > before). this seems to help but now I am concerned that I may be losing
    > real messages in that they may timeout before they reach me.
    > 3) I am running reports to see if there are any IP address that seem to
    > generate the most SMTP messages and I am trying to block those, but that
    > is obviously not too effective.
    >
    > I noticed that in the current sessions in many cases, the User Name is
    > either blank, my IP Address (obviously forged) or some other non domain
    > Name format. Is there a way to restrict the SMTP connections to only Users
    > with valid names. I know there is a way to do a DNS check on the names,
    > but that supposedly increases the demand on the server and I an concerned
    > it may make matters worse,
    >
    > I would appreciate any help or tips you can offer.
    > Thanks
    >
    >
    >

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