We are running LISTSERV 15.5 and lately I have noticed on a number of
lists a "550 No such list." error.  One thing in common is the use of a
HEX name, like 2.0006194D at a LISTSERV address (see example below).
Since we aren't sending email to these addresses, where do they come
from and is there an easy way to block them without disrupting "normal"
LISTSERV "network" activities?
-Rich
--
Richard A. Helmke                Internet: [log in to unmask]
Assoc Prof, Computer Science              [log in to unmask]
System Manager, Technical Services              Voice: 708-209-3221
Concordia Administrative Information Systems    Fax:   708-209-3177
River Forest, IL 60305-1499

-----Original Message-----
From: CAIS/CUS LISTSERV Server (15.5)
[mailto:[log in to unmask]]
Sent: Wednesday, November 19, 2008 12:01 AM
To: POSTMASTER
Subject: XXXXXX: Daily error monitoring report

The following X subscribers are currently being monitored:

Err First Last  Address
--- ----- ----- -------

  1 11/05 11/05 [log in to unmask]
                Last error: 5.1.1 Mailer [127.0.0.1] said: "550 No such
list."

  1 11/09 11/09 [log in to unmask]
                Last error: 5.1.1 Mailer [127.0.0.1] said: "550 No such
list."

  1 11/18 11/18 [log in to unmask]
                Last error: 5.1.1 Mailer [127.0.0.1] said: "550 No such
list."

  1 11/09 11/09 [log in to unmask]
                Last error: 5.1.1 Mailer [127.0.0.1] said: "550 No such
list."

Err=   Number of delivery errors received thus far
First= Date first delivery error was received (mm/dd)
Last=  Date of most current delivery error (mm/dd)

Subscribers will  be automatically  deleted from  the list  when
delivery
errors have  been reported for  a period  of 14 days  or more, or  when
4
delivery errors  have been  received, whichever occurs  first.
Monitoring
will cease after 15 days without any reported errors.

Note: Manually  deleted subscribers may  remain on the  monitoring
report
under an alias  address. Such entries will expire eventually.  You do
not
need to do anything about them.