North American Network Operators Group
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Re: Verisign suggestion

  • From: David B Harris
  • Date: Thu Sep 18 11:53:45 2003 
On Thu, 18 Sep 2003 08:24:40 -0400 (EDT)
Todd Vierling <[email protected]> wrote:
> : > ...and for heavens sake, stop accepting any kind of request at all on port
> : > 25!! Just shut it down altogether. There is no reason for you to accept
> : > any connection of any kind on port 25!
> 
> : If they don't accept anything on port 25, either by sending all packets
> : to /dev/null or by responding with SYN+RST ("Connection refused"), MTAs
> : everywhere will consider this a "temporary error."
> 
> Then the wildcard should have included a MX that points to nowhere, rather
> than implementing a fake MTA that allows the MAIL FROM and RCPT TO addresses
> to be transmitted.  The record "IN MX 0 ." is commonly used for this
> purpose.

Yeah, thanks for pointing this out. T'was an accidental omission in my
mail.

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