What about the Spamhaus DNSBL network reliability and speed?
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What about the Spamhaus DNSBL network reliability and speed?
How reliable is the Spamhaus DNSBL network?
- The Spamhaus DNSBL network currently consists of over 80 servers distributed throughout the world.
- They are mainly located in major co-location facilities with dedicated multi-megabit connections, and with extensive network peering at each facility.
- The Spamhaus DNSBL network has been designed with complete redundancy and has never been “off the air” or unavailable since its inception in 2001.
How fast is the Spamhaus DNSBL network?
- Our servers are geographically distributed around the globe and connected via high-bandwidth pipes.
- Query response time is typically in the low milliseconds and once a query is done, it is cached at the local DNS resolver for a period of time. That makes further queries “local” and extremely fast.
What happens if there is a delay?
- Modern mail-servers process separate incoming messages in parallel, so a slight pause in processing of one message will have no effect on another.
- DNS is inherently very efficient and uses a minimal amount of bandwidth.
- Using a Spamhaus DNSBL will use far less bandwidth than having to accept every spam and virus email sent to your system.
- By rejecting such email at the SMTP connection, no further data is sent thereby significantly reducing overall bandwidth use.
- DNS caching by the local resolver means that not every query counts towards outside bandwidth use.
An additional benefit is that on the hardware side, servers won’t have to do expensive post-delivery filtering and storage of spam messages.
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