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(149.161.123.100-149.161.123.149) they are allowed to send mail (port 25), receive mail (port 110),
and browse Internet (port 80); port 53 (DNS) is necessary to resolve the domain name.
(149.161.123.10-149.161.123.20) they can do everything (block nothing)
Others are all blocked.
Example 2:
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