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Error: "Client host blocked using Sorbs"
If you receive an error message indicating that once of our IP addresses is on a SORBS blacklist and your e-mail cannot be accepted, you need to contact the recipient's e-mail provider in order for them to update their spam filtering policy.
(reason: 554 5.7.1 Service unavailable; Client host [220.127.116.11] blocked using dnsbl.sorbs.net;
Currently Sending Spam See: http://www.sorbs.net/lookup.shtml?18.104.22.168)
This is because, while SORBS aims to help prevent spam, the methods they use are by no means infallible. Here is what happens when a complaint is made to them abut a single email:
- they enter the different IP addresses into their database without any checks (either to see if the message is spam or to check the authenticity of the message itself)
- they wait until they are contacted
When they are asked to remove an IP address (for example after a spammer has been identified or after a fault in a script has been rectified by our customers or in the event that it is an unfounded complaint on the basis of a message that is not real) this is the procedure:
- removal of the address is requested
- it is not possible to obtain the e-mail that caused the address to be blacklisted, and so the subject of the e-mail is not known and they therefore do not assist us in resolving any potential issue
- a certain amount of money or donation must be paid to a foundation of their choice
- we are forced to wait until the IP address has been removed from their files
You must therefore contact your correspondent's provider— and doing so is very important— in order for them to also update their system (there are plenty of other very effective lists which are kept properly up to date and hence the actual aim IS to prevent spam).
Meanwhile, neither you nor your correspondent unfortunately have control over the fact that these messages are being rejected.
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