What happens if there is a delay?
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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, and 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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