Dial-up User List is a database for the dial-up users IP addresses. Addresses are provided by ISPs. The purpose of maintaining such a database is to provide technical possibility to recognize e-mail sent directly by dial-up users (thus by-passing ISPs mail server).

The Russian variant of DUL database is maintained in DNSBL standard. The zone for Russian DUL system is dul.ru.

For ISPs

In order to add blocks of your dial-up users IP addresses into our system, you should send a request to one of the following addresses: or . Request will be considered only if it comes from one of the contact addresses of the corresponding network as specified in the RIPE database. Notification about the actions performed will be sent to tech-c addresses of that network to avoid unauthorized operations.

Only those addresses which ISPs themself want to add will be included into dul.ru. Please do not send us mails asking to add someone else's network. These requests will be rejected.

In order to change already existing records, you should send a request to or with the explanation of what should be changed or removed from dul.ru. Other requirements are the same as for adding addresses.

Note: at the time of this writing dul.ru contains address 127.0.0.3. This is made to help debugging of various applications. That is

host 3.0.0.127.dul.ru
3.0.0.127.dul.ru has address 127.0.0.3

If your IP address is in dul.ru

If you think your IP address should not be in dul.ru zone or it got there by mistake, contact you ISP. If your provider agrees with you, he can send us a mail to , in this case your IP will be deleted from dul.ru zone. If you are not sure whether your IP address is in dul.ru or not and you suspect it is, please search here: http://www.dul.ru/cgi-bin/search.cgi

Zone transfer policy

As for now transfer of dul.ru zone is open for everybody. We do not think this produces any problems for ISPs who include their addresses in our system. Generally, having all dul.ru zone doens't help in building the exact topology of provider's network and has no impact on network security. If you have strong arguments against such a policy, please let us know.

dul.ru: policy discussion

If you have any comments or suggestions regarding functioning of dul.ru zone, you can send them at or discuss in mailing list.

How to use our system.

sendmail

Add the line

FEATURE(`dnsbl', `dul.ru', `Use mail relays of your ISP')dnl

to your sendmail.mc file.

Note: This directive works in sendmail starting at version 8.10.

Look at http://www.sendmail.org/ for details.

Postfix

Just add domain dul.ru to the directive maps_rbl_domains in your configuration file.

maps_rbl_domains = dul.ru

Then activate rbl check by adding reject_maps_rbl into smtpd_recipient_restrictions or any other section of restrictions settings.

For additional information look at http://www.postfix.org/uce.html or at the sample-smtpd.cf file distributed with Postfix.

CommuniGate Pro

In the Administrator's interface: SETTINGS -> Protection-> Blacklisted IP Addresses, section Use Blacklisting DNS Servers (RBLs)

exim 4.x

hostlist rbl_no_check_hosts = < 127.0.0.1 ; aa.bb.cc.dd/mm

acl
...
...
deny	message = host $sender_host_address is listed at $dnslist_domain
dRBL
($dnslist_text)
!hosts = +rbl_no_check_hosts : +relay_hosts
dnslists = dul.ru

Mobico MIO mail

Set the flag "Use blacklisting DNS" in section "General"->"Access list" in the administrator's web-interface and provide server's address. In section "Services"->"SMTP" set the flag "Check forbidden addresses". For more details look at http://www.mobico.ru/, section "Описания".

http://ordb.org/faq/ -- FAQ available in several languages.
http://mail-abuse.org/rbl/usage.html -- English version only.