What Is A Realtime Blackhole List or RBL?
EFX internet utilizes several Realtime Blackhole Lists (RBLs) to block
the proliferation of SPAM. In practice, RBL usage effectively
blocks 96% of the SPAM that hits our server and is an invaluable tool
for providing clean inboxes for our clients. On average, 60,000
spam messages per month are blocked. RBLs are not perfect though,
and occasionally a legitimate email is blocked. This block is
implemented by the mail server utilizing the list (not the list
I'm Getting An Error: 501 5.7.1 Sender Refused
Sender refused by the DNSBL rbl.domain.org - Sender IP=xx.xx.xx.xx -
If you are visiting this page and cannot send mail to a client
on our server please fill in the form below or
Contact Us. Note your IP address
shown in the error message. You can use the lookup tool at
www.rbls.org to see
what RBL lists you are listed on. Fill in the form below so we
can whitelist your domain name. You MUST include the To:
and From: email addresses or your message will be ignored.
If you are sending mail to a client on our server we will whitelist
your domain name so you will have no future trouble sending mail.
We cannot delist you for any other servers.
Ok, I Understand, Please Whitelist Me
Fill in the form below with your email address (From:) and the email
address of the person you're trying to email (To:) and we'll whitelist
you ASAP if they are a client on our server.
What RBLs Does EFX internet Use?
Below is a list of the RBLs we implement and links to detailed information
||ZEN is the combination of all
Spamhaus IP-based DNSBLs into one single powerful and
comprehensive blocklist to make querying faster and simpler. It contains the SBL, SBLCSS, XBL and PBL blocklists.
||The SpamCop Blocking List (SCBL)
lists IP addresses which have transmitted reported email to SpamCop
users. SpamCop, service providers and individual users then use
the SCBL to block and filter unwanted email. The SCBL is
a fast and automatic list of sites sending reported mail, fueled
by a number of sources, including automated reports and SpamCop
user submissions. The SCBL is time-based, resulting in quick
and automatic delisting of these sites when reports stop.
||The Barracuda Reputation Block
List (BRBL) is a free DNSBL of IP addresses known to send spam.
Barracuda Networks fights spam and created the BRBL to help
stop the spread of spam.
We regularly evaluate and test other RBLs for effectiveness as they
become available. If you are one of our customers and do not wish
the have the protection of these RBLs contact us and we will add your
domain name to our RBL bypass list. Most users will find RBL blocking
of spam to be a time-saver and unobtrusive. If you have any other
questions not answered above please Contact