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Managed Web Site Hosting & Support Managed Web Site Hosting & Support
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  • All Features of "Premium" Managed Hosting and...
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EFX internet RBL (Realtime Blackhole List) Usage

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 provider).

I'm Getting An Error: 501 5.7.1 Sender Refused or
Sender refused by the DNSBL rbl.domain.org - Sender IP=xx.xx.xx.xx - See http://www.efxi.net/rbl.asp
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.

From: (required)
To: (required)
Your IP Address: (optional)

What RBLs Does EFX internet Use?
Below is a list of the RBLs we implement and links to detailed information pages.

RBL Website Details
zen.spamhaus.org www.spamhaus.org/zen/ 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.
 
bl.spamcop.net www.spamcop.net 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.
 
b.barracudacentral.org www.barracudacentral.org/rbl/ 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 Us.

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