[62387] in North American Network Operators' Group
Re: Verisign suggestion
daemon@ATHENA.MIT.EDU (David B Harris)
Thu Sep 18 00:36:42 2003
Date: Thu, 18 Sep 2003 00:36:05 -0400
From: David B Harris <david@eelf.ddts.net>
To: nanog@merit.edu
In-Reply-To: <20030917235533.S60076@kod.inch.com>
Mail-Copies-To: nobody
Errors-To: owner-nanog-outgoing@merit.edu
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On Thu, 18 Sep 2003 00:25:48 -0400 (EDT)
Gerald <gcoon@inch.com> wrote:
<snip>
>
> ...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!
I shall only respond to this portion. The rest of it ... well, I'll just
leave it at that :)
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." In other words, the
mail will sit on queues for weeks, typically, until an error is finally
sent to the sender. Currently an error is sent to the sender
immediately.
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