RE: [fw-wiz] Cisco PIX Version 6.3(3) SMTP Problem

From: Hammerle, Tye (Tye.F.Hammerle_at_snapon.com)
Date: 07/06/05

  • Next message: Paul Robertson: "Re: [fw-wiz] Cisco PIX Version 6.3(3) SMTP Problem"
    To: "'David M. Nicksic'" <dnicksic@mossbaygroup.com>, "'Paul D. Robertson'" <paul@compuwar.net>
    Date: Wed, 6 Jul 2005 11:27:37 -0500
    
    

    Postini can spool mail if your gateway is unreachable. Talk to your support
    rep.

    tye

    -----Original Message-----
    From: firewall-wizards-admin@honor.icsalabs.com
    [mailto:firewall-wizards-admin@honor.icsalabs.com] On Behalf Of David M.
    Nicksic
    Sent: Wednesday, July 06, 2005 10:06 AM
    To: 'Paul D. Robertson'
    Cc: firewall-wizards@honor.icsalabs.com
    Subject: RE: [fw-wiz] Cisco PIX Version 6.3(3) SMTP Problem

    Thank you for your comments about Postini, that is most helpful.

    DN

    -----Original Message-----
    From: Paul D. Robertson [mailto:paul@compuwar.net]
    Sent: Wednesday, July 06, 2005 5:51 AM
    To: David M. Nicksic
    Cc: firewall-wizards@honor.icsalabs.com
    Subject: Re: [fw-wiz] Cisco PIX Version 6.3(3) SMTP Problem

    On Tue, 5 Jul 2005, David M. Nicksic wrote:

    > I am using a PIX 520 v 6.3.3 and having a spam problem. A spam service
    > Postini is employed. I want to deny all SMTP traffic unless it comes
    > from one of the Postini servers. Can the PIX be configured to
    > accomplish this?
    >

    Almost any firewall can, however you'll be out of e-mail if the provider has
    to put up a new server because of an attack, failure, problem or address
    change. It's probably better to configure your mail server to reject based
    on forward/reverse lookups, since you're dealing with one zone, you'll be
    able to cache the lookups pretty well.

    Note that Postini rejects mail if your server isn't reachable by it- so it's
    not all that resilient if you're under attack or having server issues[1].
    Personally, I'd rather run Mailscanner on a Postfix instance than outsource
    something as critical as e-mail.

    Paul
    [1] Theoretically most things will retry, but you may want to test critical
    pager/cell/alert stuff to make sure it won't just give up if you're under
    conditions where contacting you becomes important.
    ----------------------------------------------------------------------------
    -
    Paul D. Robertson "My statements in this message are personal opinions
    paul@compuwar.net which may have no basis whatsoever in fact."

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  • Next message: Paul Robertson: "Re: [fw-wiz] Cisco PIX Version 6.3(3) SMTP Problem"

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