We, the VGER helper postmasters and listowners, are
"somewhat" trigger-happy bunch of people.
If email to you is 1) timing out (48 to 72 hours in queue),
2) refused for *any* reason by receiving systems, ALL email
addresses with your domain at VGER are very likely to be killed
away without further thought. (Not quite: 'user unknown'
is treated more selectively, only that recipient is removed.)
The example below is a case where recipient's machine's
MX-set contains server(s) which refuse to relay to given
destination domain. ('nslookup -q=mx your.domain.')
Most MTAs with anti-relay-hijack measures use files with
explicite listing of allowed destination domains. That
is a fine method, however you *must* make sure your domain
is included into that database.
There are also MTAs which accept relaying thru them if they
are in the MX set for given destination domain. I know a few
such systems which would need around 200 000 entries in the
explicite database without that facility with associated
maintance nightmare, however those softwares are rarely in
your average ISP's use...
/Matti Aarnio <mea@nic.funet.fi>
------- extract from one error report ------
This is a collection of reports about email delivery
process concerning a message you originated:
<smtp l9.ipu.rssi.ru linux-gcc@l9.ipu.rssi.ru 60000>: ...\
<<- RCPT To:<linux-gcc@l9.ipu.rssi.ru> ORCPT=rfc822;linux-gcc@l9.ipu.rssi.ru
->> 550 <linux-gcc@l9.ipu.rssi.ru>... we do not relay
--S.qdvrN19577=_/nic.funet.fi
Content-Type: message/delivery-status
Reporting-MTA: dns; nic.funet.fi
Arrival-Date: Thu, 21 Jan 1999 06:47:34 +0200
Original-Recipient: rfc822;linux-gcc@l9.ipu.rssi.ru
Final-Recipient: RFC822;linux-gcc@l9.ipu.rssi.ru
Action: failed
Status: 5.1.1 (bad destination mailbox)
Diagnostic-Code: smtp; 550 (<linux-gcc@l9.ipu.rssi.ru>... we do not relay)
Remote-MTA: dns; user.ipu.rssi.ru (193.232.196.4|25|128.214.248.6|4648)
Last-Attempt-Date: Thu, 21 Jan 1999 06:49:10 +0200
-
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