[Mimedefang] Sendmail::Milter

Les Mikesell lesmikesell at gmail.com
Tue Nov 24 16:12:11 EST 2009

- wrote:
> --- On Tue, 11/24/09, Tilman Schmidt <t.schmidt at phoenixsoftware.de> wrote:
>> Am 2009-11-23 21:38 schrieb -:
>>> I too limit connections to one, and one per 5
>> minutes.  Should remotes violate that, they get two
>> warnings (ICMP admin-prohibited), and if they're too eager,
>> they fall into my TCP TARPIT.
>> I wonder. Do you have any data on how typical mail server software
>> reacts to that sort of policy? What does, for example, a Sendmail or
>> Exchange server in default configuration do if it tries to deliver two
>> mails to a destination server, the first one succeeds, and the second
>> one fails with "administratively prohibited"?
> Which would only happen if they tried to open two separate TCP sessions within the 5 minute window.

Which will almost certainly happen regularly if anyone joins a mailling 
list that is slightly busier than this one.

   Les Mikesell
    lesmikesell at gmail.com

More information about the MIMEDefang mailing list