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Solve an email block (RBL)
This guide presents how RBLs work, the questionable politics of some of them and the means to solve a possible blockage.
What is RBL?
The RBL (Realtime Blackhole List) or DNSBL (DNS Black List) are lists containing addresses/IPs/names of providers/servers reputed to be major senders of spam.
These are often large generalized blacklists (blacklist), making it possible to identify messages considered undesirable and those who send them, maintained by certain service providers ( smtpcheck , uceprotect : non-exhaustive list )...
When an email address is identified as belonging to a spam sender, we block it to prevent the receipt of unsolicited mail. A block in our RBL does not expire. Addresses will be listed indefinitely.
What to do in case of blocking on this subject?
If you receive a message that your email address is blocked by RBL, it means that our security system has detected suspicious or unwanted activity associated with this email address. This may include sending unsolicited mass mailings, participating in phishing campaigns or other malicious behavior.
If the error mentions your address and RBL
If you get type errors
anna.a@domain.xyz is rbl blacklisted - http://chk.me/rbl
when sending an e-mail and you think it is a false positive, our support remains at your disposal if needed.
To prevent your email address from being blocked by our RBL blocking system in the future, please follow these email best practices:
- do not send unsolicited mail or mass messages to unknown recipients ( find out more )
- regularly sort your list of recipients
- not engage in phishing or cybercrime activities
- ensure the highest level of security where your emails are used:
- strong password
- up-to-date software
- operating system (Android/iOS/Windows/macOS etc.) up to date
If the error mentions an organism like Sorbs or Barracuda
If you get type errors
554 5.7.1 Client host blocked using sorbs
or similar, you must:
- follow the procedure of the organization mentioned (for example http://www.barracudacentral.org ) to obtain the removal of your address from the list
- temporarily change Internet service provider or connection method - WIFI vs 4G/5G - to send your messages
- inform your correspondent and his messaging provider to take the necessary action and/or to no longer use an unreliable RBL
- wait a few hours and try again
Fewer and fewer professionals (ISPs, hosts, etc.) are using Backscatterer / UCEPROTECT type service providers whose vocation is above all financial and there are a lot of other very effective lists, such as ABUSIX or SPAMCOP , well kept up to date and whose the real goal is to fight against spam, one of our priorities .