RE: [NTISP] Blacklist for SMTP

Stainforth, Matthew ( (no email) )
Mon, 25 Oct 1999 09:33:54 -0300

It's really hard to say why you are getting this response. You would have
to ask the administrator to find out. I can tell you the 4xx error range is
defined as temporary and retry-able which would be a bizarre configuration
for spam blocking.


-----Original Message-----
From: Malcolm Joosse []
Sent: Monday, October 25, 1999 9:21 AM
Subject: [NTISP] Blacklist for SMTP

Hello list,
I have been having troubles sending to about 20 email servers.
We send out about 500 messages and recieve about 2000 per day from 1 NTMail
3.02 server.
I am getting the following errors from their SMTP service:

Connected to
421 SMTP Service not available, Closing transmission channel.