Stuff…

Bounce message received:
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
user@fromaddress.com
Malformed SMTP reply from mail.server.com [192168.1.1]
in response to initial connection:
rblsmtpd: 192.168.6.62 pid 14483: 451 Sender has sent to LashBack
Unsubscribe Probe accounts:
retry timeout exceeded
Looking further into this it appears that the [...]

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Upgrading from Windows Parallels Plesk 8.1.1 to 8.6 went smoothly according to the installer, however, after the upgrade completed and machine rebooted the Plesk control panel no longer loaded.
It would often return an error to the browser, but, also occasionally would say:
get_config_string failed: PRODUCT_DATA_D: The system cannot find the file specified. (Error code 2) at [...]

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I was getting a bit bored of manually testing SMTP AUTH details for people so wrote a quick little script in perl (with help of modules) to test.
#!/usr/bin/perl -w
use Net::SMTP_auth;
use Getopt::Std;
%options=();
getopts(“u:p:h:”,\%options);
my $_USAGE= <<END_USAGE;
test_auth.pl   -  Check SMTP authentication
Usage:   test_auth.pl -u user -p pass -h hostname
License: This software is released under the same terms as perl itself.
END_USAGE
die [...]

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Needed to add RBL checking into sendmail as the machine was under attack by some smtp botnet.  RAQ550s had no inbuilt RBL support so had to update the sendmail.cf manually.
URL: http://www.cobaltuserslist.com/CobaltUsersList/Sun-Cobalt-Users-List-76800.html
The example is a bit old… the RBLs I used are: cbl.abuseat.org , bl.spamcop.net, sbl.spamhaus.org
Cobalt list post:

RBL (Realtime Blackhole List) filtering allows your sendmail installation
to [...]

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Occasionally you may want to test your mail server to see if it accepts unauthenticated mail to be relayed.
These URLs allow you to do this:

http://www.abuse.net/relay.html
http://www.dnsgoodies.com/
http://www.checkor.com/

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