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DNS Stuff - A large collection of DNS utilties combined into one site. www.dnsstuff.com
Sam Spade - Dns tools and Blacklist Lookups. http://www.samspade.org/
DNS.net - Tools to manage DNS. http://www.dns.net/dnsrd/tools.html
Demon tools - Internet Tools http://www.demon.net/toolkit/internettools/
NW Tools - Ping / Traceroute / NSlookup/ etc http://network-tools.com/
MAIL / Webbased Relay Checkers
Abuse.net relay testing www.abuse.net/relay.html
Open Relay Database Test - ordb.org/submit/
Open Relay Test members.iinet.net.au/~remmie/relay/
Mail Server Relay Test -www.lucidlogic.com/relay.php
Anonymous Relay Test www.antispam-ufrj.pads.ufrj.br/test-relay.html
Anonymous Relay Test -www.aupads.org/test-relay.html
Test your mail server for an open relay www.truson.biz/services/spam_tester.php
Third Party Relay Check www.rbl.jp/svcheck.php
Mailserver Open Relay Check msv.dk/ms009.asp
SpamHelp.org SMTP Open Relay Test - www.spamhelp.org/shopenrelay/
Open Relay Test - www.lashampoo.net/unix/testrelay
Ted's Webtools - Open Relay Test http://www.mob.net/~ted/tools/relaytester.php3
MAIL / Telnet Relay Checkers
Telnet to the server shown from the server you wish to test.
mrt - www.monkeys.com/mrt/ - Perl
rlytest - www.unicom.com/sw/rlytest/ - Perl
mtaprobe.exp - www.cymru.com/Tools/mtaprobe.exp - Expect
relaycheck.pl - arpa.org/relaycheck.pl - Perl
SMTP Open Relay Checker - sourceforge.net/projects/smtprc - FreeBSD
testrelay - www.kluge.net/~felicity/random/testrelay.txt - Perl relaytest -
ftp://ftp.ruhr-uni-bochum.de/local/mail/spamtools/relaytest - Perl
RelayTest - www.digiarch.org/relaytest.html - Win
SORBS - sorbs.sourceforge.net/ - checks incoming servers for open relays and proxies
Discussion and the format for relay tests.
Relay Testing Envelopes -www.chebucto.ns.ca/~af380/envelopes.txt
Open Relay Verifying Engine Tests -www.aupads.org/working.html
Relay Testing Envelopes -www.ki.nu/software/sendmail/orbs-envelopes.shtml
Some open relay tests -www.reedmedia.net/misc/mail/open-relay.html